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Loz73 at 10:45 AM on 11 August 2019The consensus on consensus messaging
In Australia the reason that, “Voters believe that there is no consensus about global warming with the scientific community” (Nigelj) is that no Australian scientist has ever persisted in telling them otherwise. As a retired biological scientist with 10 years of activism in BREAZE (Ballarat Renewable Energy & Zero Emissions) I am in a state of despair. Parts of Australia are in the worst drought in history; the Barrier Reef and the Murray Darling basin are in terminal decline; our Prime Minister fondled a lump of coal in parliament and told us not to be afraid; and neither of the main political parties opposed the giant Adani mine. Virulent attacks on young Swedish activist Greta Thunberg and school strikers here confirm how terrified those on the hard right of politics and media are of the youthful threat but they’re nowhere near terrified enough yet. As the life support systems of all creatures face extinction, though, comment by Australia’s climate scientists continues to be so subdued as to be ineffectual.
Scientists have one last chance of redemption. It doesn't involve the safe pathway of publishing ever more articles in prestigious journals to fine-tune what we already know. Instead, we are suggesting that climate scientist show leadership and join students to form an alliance that cannot be silenced. If we are to avoid the catastrophe of a 2 degree temperature rise we need activism on the scale of the Vietnam era protests, with kids in every school screaming for action and screaming for their parents to support it, and we need to have kids supported by loud and hard evidence from fearless scientists. Now is the time for action and hope. -
michael sweet at 10:22 AM on 11 August 20192019 SkS Weekly Climate Change & Global Warming News Roundup #32
Nigelj,
My understanding is that if people eat less meat that much less land needs to be in cultivation, not more as you suggest. Since less land is in cultivation and less is needed for grazing livestock more can be used for forrests or biofuels.
Currently much of agricultural production of plant type foods like corn and soybeans is fed to animals. If we eat the corn and soybeans instead much less food needs to be produced. You have to feed an animal about 10 pounds of food to get one pound of meat. If you eat the feed you need less farm production because you directly eat the plants the farm grows.
Unfortunately, most people prefer a high meat diet.
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One Planet Only Forever at 08:42 AM on 11 August 2019Can Land cause Climate Change? (new IPCC report)
The following 'Buisiness-Minded' way of thinking is a general problem that relates to the 'farming practices point' that william raises.
Return On Investment is desired. But discounting the future and having the ability to easily move wealth to other investment opportunities around the world leads to thinking that a good business opportunity is one where:
- the initial investment will be paid back within 3 years
- and the business will continue for about 10 years.
- Anything beyond 10 years is a bonus.
- And the business collapsing at 10 years is OK as long as there are ot end costs that cannot be minimized by things like bankrupcy protection that limit the loses. The money made can be invested in a new 'Best Investment Opportunity'.
The quest for those opportunities leads to the challenges that result in the industrial take-over of farmland that has no real future, but looks great on the balance sheet of today.
DIscounting the future combined with desires for maximum quickest personal gain is unsustainable and disaster creating.
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nigelj at 07:33 AM on 11 August 20192019 SkS Weekly Climate Change & Global Warming News Roundup #32
“Land can’t, at the same time, feed people, and grow trees to be burned for bioenergy, and store carbon,” Stabinsky said.
Yes, this is the essence of the problem, although there is one possibility for feeding people and growing more trees if we sacrifice livestock grazing lands. The area of the world in grasslands livestock farming is huge. The IPCC is encouraging a low meat diet because of the methane problem and that meat is an inefficient use of resources. Grasslands freed up could be used for a mixture of crops, forests and biofuels. A lot of this land would need to be in crops to replace reduced meat consumption, and for a growing population, and not all cattle farming is likely to be replaced, so use for forests still looks limited in potential.
This is a conundrum as well, because there is some evidence properly managed livestock grazing has the potential to store more soil carbon than presently. However things look to be heading towards lower meat consumption so less livestock grazing lands. What's left could still be better managed to conserve more soil carbon.
It's a complicated problem. It makes sense to stop deforestation and grow more trees, but the potential looks ultimately limited to using little bits of spare land, not continent sized BECCS plantations. One thing seems to be a given: Large areas of the planet will remain in crop lands, so we should look carefully at the potential of these to store more carbon using regenerative agriculture. It's there so use it.
Maybe there are other possibilities, or I'm not seeing it right?
Table of global land use data:
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william5331 at 06:21 AM on 11 August 2019Can Land cause Climate Change? (new IPCC report)
ps. When correct farming is practiced, carbon is sequestered in the soil and would you believe, the bottom line of the farmer improves.
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william5331 at 06:17 AM on 11 August 2019Can Land cause Climate Change? (new IPCC report)
Our effect on the climate due to our use of the land is apparently not new. If you read the book Plows, Plagues and Petroleum by Ruddiman he makes a very convincing case that we were delaying our slide into the next glacial period by our use of the land, including, significantly, the use of the plow as we vented sequestered carbon into the atmosphere.
Come forward and read the three books by David R Montgomety, Dirt, Growing a revolution and The Hidden Half of Nature.
The first describes what happens when a civilization treats her soil like dirt and how many hundreds of years it takes the soil to rebuild from the underlying bed rock when that civilization disappears.
The second describes his globe trotting trip to see the very few farmers in widely different soils, climates, political regimes and widely diffent sizes from small holdings to huge ranches, that have come up with a better way of farming. He describes how you can restore your soil in an amazing short three years by correct farming methods.
The third describes the inner working of a rich organic soil including the knowlege from recent research.
I have heard he is working on a fouth book in the series describing the food value of crops grown in rich organic soils vs sterile soils using chemical nutrients.
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Rob Honeycutt at 03:43 AM on 11 August 2019There is no consensus
"Well now we're getting back on topic. Is that your opinion, or do you have studies to back it? This thread refers to several studies that document a strong consensus that AGW EXISTS."
That's been the subject matter of all the studies listed in the OP here. But perhaps you different expectations of what defines a consensus.
Here's the way I think of it. Much of the human population doesn't have much of a grasp of what is going on with climate change. In the press this issue gets presented as a 50/50 possibility. Two sides arguing whether this is real or not. The point of all these research papers is merely to say, "Hello! Look here! Nearly all scientists agree this is real and that it presents a significant problem for our planet." I believe all of the 97% of working climate scientists out there would agree with that statement.
The Cook 2013 paper (noted in the OP) specifically tested the notion that AGW exists but would have minimal effects. That position was very low, inclusive of the 3% of studies.
If you're looking for something that specifically states how damaging AGW will be, I don't think you're going to find that. This is a question that (as Schneider states in that video) this is a systems problem with a wide range of potential outcomes based on both what we do and how the climate system responds.
As Yogi Berra said, "Predictions are hard, especially about the future."
I don't think there are many scientists who would disagree with the idea that this might not be as bad as we expect. They'd also tell you that a very low probability. There's an equally low probability that this will turn out much, much worse that expected, and that's a very scary possibility on par with nuclear armageddon. The mid-range higher probability outcomes are already very bad if we don't get emissions down quickly.
Scientists, as I understand it, are not concerned much about the consensus. They're out there grappling with issues like quantifying the pace of ice sheet melt in Antarctica.
It's real. It's bad. It's us. These are all accepted. The questions are: how bad? How fast is it happening? How quickly can we get to zero emissions?
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Rob Honeycutt at 03:09 AM on 11 August 2019There is no consensus
cstrouss...
"Now who is engaging in hyperbole? Are we digging everything we can out of the earth? And if so, who is proposing that we continue doing that? Is the collapse of civilization with continued CO2 emissions also part of the consensus? Documentation?"
In truth, no, I don't think this is hyperbole since it's firmly based in the realm of possibilities. Human's have an enormous capacity for accomplishments on massive scales. As a species, we have the collective nuclear weapony sufficient to end all life on this planet, possibly permanently (or at least for coming many millions of years). Likewise, oil companies have identified reserves sufficient, were it all burned, to raise the surface temp of this planet to levels that would collapse civilization. And they're continuing to locate more.
Will we nuke the planet? I hope not but it's not outside the realm of possibilities. In that, it's extremely important that nations of the world work together to manage this possibility.
Will we burn all those reserves? I also hope we won't do that, but it's even more likely than nuclear armageddon, specifically because there is a massive financial incentive for those oil companies to put their sources of energy on the market.
I'm a firm believer that the problem we face is a market failure: the failure to price the social costs of carbon emissions. If there were a price on carbon emissions then carbon-free sources of energy would be abundantly cheaper than carbon-based energy. There are a lot of very large companies and very wealthy, powerful people who prefer not to seen their sources of wealth conform to a levelized market. ...because they know they'll lose.
If you want documentation on the impacts of high CO2 levels, I'll have to do some additional reasearch. It seems pretty clear that nearly all the expected effects of high CO2 will negatively affect agriculture. Increased rain intensity. Increased droughts. Desertification. Increase in pest species. There's a lot of research on this and I've even read a bunch of it. It would just take some time to pull together relevant research. I'm sure there are a number of good articles written here on SkS on the topic.
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MA Rodger at 21:09 PM on 10 August 2019There is no consensus
cstrouss @813,
While off-topic, this question to you may prove a route to bringing this on-topic.
I note you mention repeatedly the "logaricmic nature of the greenhouse effect" which you see as a factor poorly considered in tackling AGW. "And I see no recognition of the logarithmic nature of the greenhouse effect, which makes the political problems almost insurmountable."
The logarithmic relationship between CO2 concentrations and the resulting climate forcing isn't usually seen as causing an "almost insurmountable" problem for AGW mitigation so perhaps you could explain.
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MA Rodger at 20:45 PM on 10 August 2019Models are unreliable
rupisnark @1138,
I'm not sure how helpful Christy's responses are other than to demonstrate again how error-prone Christy is.Up-thread I branded Christy's talk as error-filled and we do get Christy admitting to one error. In so doing he demonstrates a few more errors.
He admits the "atmosphere" units needed correcting. I assume this "atmosphere" concern the 750 million figure. (Note, this issue can now be retrieved from your long grass @1117 as I see Christy quotes the figure in GWPF Note 17 linked @1130.)
The "atmosphere" units are obviously in need of correction but the corrected units are not "joules" as Christy says. The units are 1 unit≈3.4 j/m2 globally. This is something understood back @1113 so this should come as no great revelation. And of course this 750 million units is a measure of the total thermal heat content of the atmosphere down to absolute zero, as assumed @1113. It is a rather silly comparison. Perhaps a better comparison would be a value of the atmosphere's changed heat content that would entirely stuff the climate for us, say an ice age of -6ºC globally (or AGW of +6ºC) which would require losing (or gaining) 20 million of Christy's units in the atmosphere.The 6 trillion figure appears solely within the talk transcript. "About £47 comes into this bank account (down at the surface). By the way, that account has about £6 trillion in it right now. So we’re talking about small numbers compared to the vast reservoir of these energies." The "£47 com(ing) in" is 47 x 3.4 = 160Wm^-2.
Up-thread @1119, I put this 6 trillion figure as being 80-times too big for the total ocean heat content (down to absolute zero). That 80-times estimate was in error. Totting it up again, perhaps it could be 0.6 trillion. But it is an absurd quantity to be wielding. The oceans, as oceans, have a lot less heat content before they freeze down to the sea bed and cease being oceans. Indeed almost half my estimated 0.6 trillion is the melt energy. And in a sensible comparison (ie the +/-6ºC one) the ice melt/freeze becomes even more the dominant factor, 0.002 trillion warming/cooling water & 0.004 or 0.008 trillion melting or freezing ice.What is more interesting than Christy's silly use of big big big numbers is Christy's description of 'the missed point'. Actually it has not been 'missed'. As set out up-thread, I am well aware of the point he is trying to make. His 0.5 units is small in comparison to the other numbers he chooses to wield as he wishes to diminish the importance of the 0.5 units..
But in this 'correction' his reply to you is riven with error. (He can't even get a correction correct!!)"The 0.5 is still very small compared to the fluctuations of the 100 units or so in the other flows of energy."
This is poorly written but does imply the "fluctuations" are "100 units or so" which is again absurd. And it is not what he says in either his talk or GWPF Note 17.
"...we have hundreds of units going back and forth, and varying by much more than half a unit over time. In other words, evaporation might be 24 one month, but it might be 26 the next. Radiation from the surface might be 105, or it could be 102. So now you see that 0.5 of a unit is almost in the noise level of what happens."
The constant 0.5 imbalance is "almost" (Christy also says "much more" which is a poor description - "more" yes, "much more" no.) the same size as the occasional fluctuations, his examples being monthly wobbles of +/-1.0 & +/-1.5. Christy is wrong with his comparison of the 0.5 with 100. He is also wrong to compare a constant effect with occasional wobbly ones.
And he is also wrong in stating "The 54 million joules is not being retained in the system each year as the critic implies."
I assume I am the critic and that the "54 million" originates @1113 which says:-"But 0.5 'units' would amount to 0.5 x 3.4 x 8766 x 3600 = 54 million j/sq m in a single year. It would take a bit of a fool to dismiss this as "small numbers", but then we are talking about John Christy."
Christy is wrong to say I "imply" the retention of the 0.5 units flux. It is Christy's diagrams that imply it. Yet in both his talk and GWPF Note 17 Christy even manages to deny that any of this 0.5 unit is retained. "Note that the surface is in balance too, with the number of incoming units equal to the number outgoing." Of this 0.5 units (1.7Wm^-2) of climate forcing, the imbalance is 0.2 units (0.7Wm^-2 = 22Mjm^-2/yr) and this flux is "retained" energy. The source Christy uses to get his numbers ("Values per AR5 Fig. 2.11") makes the existence of that 0.2 units (0.7Wm^-2 = 22Mjm^-2/yr) quite plain, at least plain to the whole world but not to John Christy who appears to inhabit a different planet.
So a sensible comparison of that 0.2 units of global imbalance (or 22 million jm^-2/year) would be a comparison with the climate-busting AGW of +6ºC. That would require perhaps 68 million jm^-2 (3 years' worth) to warm the atmosphere and perhaps 20,000 million jm^-2 (a thousand years' worth) to warm the oceans and melt the global ice.
Taking the current rate of AGW (0.019ºC/yr) as being the product of the 0.2 units of global energy imbalance and we are 300 years away from +6ºC of climate-busting AGW, or should that be 250 years as we have managed +1ºC already. -
Eclectic at 20:08 PM on 10 August 2019There is no consensus
Cstrouss ,
I also have a 20-year-old car. That's not a rare state of affairs.
But I do not have the anger issues which you are displaying. If you wish to go further in discussing the range of topics you are raising, then please [in accordance with SkS site posting rules] take each separate aspect to its own appropriate thread.
The posting rules exist precisely for this purpose — to prevent every thread becoming a chaos of churning unresolving random shoot-em-ups by those without the mental discipline to clearly think through the individual aspects (which make up the "whole").
But you may find that the Moderators give short shrift to those whose "shotgun pellets" land in a handful of threads simultaneously. So please draw up your own mental list of matters which trouble or anger you — and select the most important one, and post that. Once that one has had a reasonable airing [resolved to general satisfaction; or put aside as "agreeing to differ"] then move on to your "second priority" aspect . . . and so on.
Clear thinking, without the obfuscations & rhetorical deceits & uninsightful semantic confusions . . . is more likely to bring you the satisfaction you are requiring. Yes, there is the risk that you might find you have to change your current "beliefs" — but I would like to imagine you have the courage to put your intellect ahead of your ego.
"Motivated Reasoning" is a danger to all of us . . . don't you think?
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cstrouss at 17:23 PM on 10 August 2019There is no consensus
Eclectic wrote:
>>> the scientific consensus is about the science, not the political response required. <<<
Yes, and I'm trying to keep that distinction clear. The consensus is that there is a problem. And given the inherently geo-political nature of the problem, I have not yet seen a workable solution proposed, let alone any wide consensus on it. In fact I very rarely see mention of the logarithmic nature of the problem, which is what makes it so intractable.
Is there another forum where those issues are discussed?
>>> ... the facts indicate that it would be foolish to delay the conversion to a renewables-based economy. Is there any other conclusion to be drawn from the consensus? <<<
Well again we have to be clear on what the consensus is. This thread is about documenting and quanitfying the consensus that AGW exists, not about its scope or the urgency of solutions. Some have asserted in the last few comments that the consensus is that the latest IPCC report is correct, which is a step in that direction, but there is no evidence presented for that or how wide the consensus may be.
>>> Cstrouss, if you have a point to make then please make it clearly and simply (and on another, more appropriate thread). <<<
I agree, my question has been answered... the consensus is that AGW exists, as indicated in the formal proposition in the header, and consistent with my other reading. I'm not the one continuing the discussion into separate issues, like the severity, urgency, and strategies.
I wrote:
"...That the AGW hypothesis is true... Or that there it is a catastrophic situation and humans must immediately... <<<
Rob Honeycutt responded:
>>> Why is this an either/or question? Can they not both be true? <<<
They can both be true, but are they both the consensus? If the consensus includes the latter, could you present evidence of that?
>>> What you're doing, though, is running off into hyperbole... <<<
Yes, guilty, that one thing was a bit overboard. My point is that what is being proposed are some very radical solutions with no real return, unless you go with the idea that if the USA spends a great deal of money, the rest of the world, including much poorer and rapidly developing regions will follow. (I heard Sanders say something along those lines the other day.)
But of course that gets far outside the domain of climate science. It is a matter for political science and psychology, and necessarily involves a tremendous amount of speculation.
>>> Therein lay the problem. Yes, if we continue to burn everything we can get dig out of the earth, most scientists will likely agree that would probably mean a total collapse of modern civilization. Lots of death, destruction and suffering. <<<
Now who is engaging in hyperbole? Are we digging everything we can out of the earth? And if so, who is proposing that we continue doing that? Is the collapse of civilization with continued CO2 emissions also part of the consensus? Documentation?
>>> Can we avoid that? Yes, of course. We are going to see significant challenges and costs due to our emissions so far. We are already seeing very good signs of progress with the cost of wind and solar continuing to fall. But there are so many more challenges we're going to see. <<<
Again, we agree on that. I think it is great for wealthy people in wealthy nations to voluntarily adopt more expensive alternative forms of energy. In fact all of my super affluent friends are already making great strides, except for their regular jet travel.
And no doubt progress is being made on the technology, and the small-scale interim deployments have been helping to refine the tech. I have two good friends who have been working as engineers on photovoltaic systems for at least 25 years. They tell me we can expect a lot of changes in the next 20 years.The issue is what to do with the less affluent population. Will I be left behind? And even though I'm in the lower end of income in the USA, I'm still in the upper end in the world. I can barely afford one tank of gas per month in my 20 year old compact car now.
I know that places where large numbers of people are rising out of dire poverty for the first time, like areas in Asia and Africa, are on the ragged edge of affording energy in the first place. Even when alternatives are CLOSE to fossil fuel costs, that is a luxury they will not be able to afford. I'm sure you're aware of studies that show people will only sacrifice to improve their natural environment after a certain level of affluence is attained.
I'm sure you'll agree that it will not address the problem if the richest 20% reduce their emissions by 50%, when a billion or two people are increasing their consumption a great deal from virtually zero. So any attempts to force those nations and people to reduce (instead of increase) their use of fossil fuels will only happen if those rich nations are willing to foot the bill for alternative electrification. Certainly it is technically feasible, and would make a lot of sense, since distributed solar is a more efficient way of building rural electrical systems than power plants and long wired grids, but I have not heard this level of financial assistance being proposed.
>>> Nothing I'm saying here is controversial, and I believe this would all fall within the definition of the "scientific consensus on AGW." <<<
Well now we're getting back on topic. Is that your opinion, or do you have studies to back it? This thread refers to several studies that document a strong consensus that AGW EXISTS. I have not scoured the whole thing, but I have not seen any evidence to quantify the consensus for stronger propositions. Certainly that would have to be considerably less than the approximately 97% which apparently accept the minimalist proposition.
>>> Here's what should give you the most concern about all this: thermal inertia.... Best case scenario says we'll be able to bring emissions to zero by ~2050. That means continued warming through 2080 at a minimum. <<<
Yes yes, I understand that. But I have not heard any suggestions on how global emissions could realistically go to zero by 2050.
michael sweet wrote:
>> It is too bad that you canot afford future electric cars. According to this white paper put out by BNP Paribas (the eighth largest bank in the world) between 2020 and 2022 electric cars using renewable energy (wind and solar) will be by far the cheapest cars. You will be spending more to pollute the air for the rest of us. <<<
Wow, I'm really sorry I'm so poor I have to inconvenience rich people who can afford new cars. Thank you for the compassion and understanding for those less fortunate than yourself. And by the way, any solutions that do not address the issues of the less affluent masses will never happen.
By the time a 2020 electric car is affordable for people like me who need simple, reliable 20 year old cars, I'll be dead. Also, given battery life issues, it isn't clear whether any 2020 models will still be serviceable when they are 20 years old.
>>>... You show your true colors when you call Greta Thunberg an actor. <<<
I tried to research her. Certainly her parents and grandfather are in show biz. I couldn't find much else about her, but I'm going to assume she is not a published climate scientist who did original research. She seems to be repeating what others have told her... in other words, a celebrity spokesperson, and not a source.
Rob Honeycutt wrote:
>>> This is a genuinely bizarre statement: "Most of the IPCC signatories don't even agree with the entire report. So the IPCC report is not the consensus."... I'm very curious where you picked that up. <<<
Yeah, me too... I can't find it again now. I have seen interviews with signatories who were critical of how the process was segmented, and who very displeased with how the politicians tacked on a "summary for policymakers" that did not follow from the scientific parts of the report.
And I've read letters from other sigantories who have clarified that they do not agree with all of the conclusions, which of course is inevitable, as you won't ever get 2500 people to agree with everything in a long document, or even 97% of them.
But since I can't find my references at the moment, I'll retract it unless and until I can document it. Meanwhile, I think the burden of proof is on those who assert that the IPCC report does represent a community-wide consensus.
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Rob Honeycutt at 14:56 PM on 10 August 2019There is no consensus
This is a genuinely bizarre statement: "Most of the IPCC signatories don't even agree with the entire report. So the IPCC report is not the consensus."
I'm very curious where you picked that up.
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michael sweet at 10:59 AM on 10 August 2019There is no consensus
Cstrouss,
It is too bad that you canot afford future electric cars. According to this white paper put out by BNP Paribas (the eighth largest bank in the world) between 2020 and 2022 electric cars using renewable energy (wind and solar) will be by far the cheapest cars. You will be spending more to pollute the air for the rest of us.
You show your true colors when you call Greta Thunberg an actor.
I can see where you are going. Unfortunately, I do not have time for you today. Good luck.
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Rob Honeycutt at 09:42 AM on 10 August 2019There is no consensus
You know, I bet you might find this short video compelling.
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Rob Honeycutt at 09:21 AM on 10 August 2019There is no consensus
cstrouss...
"That the AGW hypothesis is true and it will have increasing implications on global weather patterns? Or that there it is a catastrophic situation and human must immediately and completely restructure our social and economic systems if the species is to survive?
Why is this an either/or question? Can they not both be true?
Think of climate change impacts as a sliding scale that vary based on our total emissions. Within a reasonable range of uncertainty, probably the best understood elements of AGW are the basics of radiative forcing and the response in global mean temperature. The concensus is that we'll likely see about 2.8°C of warming for each doubling of CO2 over preindustrial levels. I think almost every scientist working in the field would agree with that statement.
We also know for certain, the more we push the system, the more damage we're ultimately going to see. Again, that's not a controversial statement for scientists.
What you're doing, though, is running off into hyperbole. I don't think many scientists would agree that we must "...immediately and completely restructure our social and economic systems if the species is to survive." Our species is likely to survive whatever happens. We're extraordinarily adaptable. But, most of the natural world that we rely on to sustain 7+ billion people on the planet is not nearly as adaptable as we are.
Therein lay the problem. Yes, if we continue to burn everything we can get dig out of the earth, most scientists will likely agree that would probably mean a total collapse of modern civilization. Lots of death, destruction and suffering.
Can we avoid that? Yes, of course. We are going to see significant challenges and costs due to our emissions so far. We are already seeing very good signs of progress with the cost of wind and solar continuing to fall. But there are so many more challenges we're going to see.
Nothing I'm saying here is controversial, and I believe this would all fall within the definition of the "scientific consensus on AGW."
Here's what should give you the most concern about all this: thermal inertia.
I hope you agree that we are now seeing many of the impacts of climate change starting to emerge. Melting ice sheets, extreme weather events, heat waves, etc. Now, consider that there is a 30 year lag in the climate system since most of the heat goes into the world's oceans. That heat takes time to come into equilibrium with the land, ice and atmosphere. Thus the impacts we're seeing today are the result of where CO2 levels were some 30 years ago.
If we were to stop all carbon emissions tomorrow the planet would continue to warm through the middle of this century. If we're seeing impacts already you can bet your bottom dollar they're going to start getting a lot worse over the coming three decades. Best case scenario says we'll be able to bring emissions to zero by ~2050. That means continued warming through 2080 at a minimum.
Also consider that, in the past at 450ppmv CO2 levels, there were no ice sheets on this planet. The planet was too warm to sustain them. It'll take another 1000 years to melt them entirely, but we're talking about sea levels rising to up to 70m over the coming centuries. That's a completely different planet than we currently live on. No Florida at all. It's gone. LA, SF, NYC, Tokyo, and 100's of other cities. All under water.
It's not the end of our species but replacing entire cities ain't gonna be cheap. The better investment is to reduce our carbon emissions as quickly as we can and keep CO2 levels as low as we possibly can. That's an enormous task. It's one that needs to happen fast.
Again, none of this is controversial. Gore, DiCaprio and Thunberg are not scientists but they are doing their level best to help convey to the world what is overwhelmingly agreed in the scientific community.
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Eclectic at 09:18 AM on 10 August 2019There is no consensus
Cstrouss ,
the scientific consensus is about the science, not the political response required.
The so-called Green New Deal which might "radically transform" the U.S. economy (in less than 12 years?!?! ) . . . is mere fanciful hyperbole. Nor would it directly involve the other 95% of the world's population.
Cstrouss, you are using the GND as a strawman (straw-woman??). Please take a sensible look at the scientific facts — and the facts indicate that it would be foolish to delay the conversion to a renewables-based economy. Is there any other conclusion to be drawn from the consensus?
Cstrouss, if you have a point to make then please make it clearly and simply (and on another, more appropriate thread).
No need for straw.
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Eclectic at 09:02 AM on 10 August 2019Models are unreliable
Rupisnark , the presence (or absence) of a "gnat", does not somehow abolish the herd of rampaging elephants [melting ice, rising sea-levels, rising temperatures, ocean acidification].
To continue the metaphor — a policy of ignoring the elephants is exactly the policy which will result in the unnecessary death of millions (mainly the poor) and in unnecessary damage to our world economy.
Your rhetoric is seriously misplaced.
And the good Dr Christy is being disingenuous with his audience. His comments are akin to saying: "Oh, we humans have only changed the atmospheric composition by one part in 10,000 . . . such a tiny figure could surely, surely, surely never alter the climate, eh?"
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rupisnark at 05:21 AM on 10 August 2019Models are unreliable
Eclectic @ 1134
Given the way the climate models are constructed, if they are make incorrect predictions, then they are not necessarily reliable.When an editor of this blog pointed me to several sources and the first says:-
“That is to say, is the troposphere actually warming as expected? Unfortunately, the answer to this is much less cut and dry” and the third (the paper by Steven C Sherwood and Nidhi Nishant) says “...as shown in previous studies, tropospheric warming does not reach quite as high in the tropics and subtropics as predicted in typical models” then it is clear that this is more than a gnat.“ the gnat is simply a gnat…While all around you is a stampede of elephants “. If the climate change hypothesis is wrong and policies are followed that reduce global growth by >1% pa as is being proposed, it will cost millions of lives, so perhaps your analogy suggests that it is climate scientists stampeding people to cause (indirectly) millions of deaths?
Moderator Response:[DB] Sloganeering snipped.
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rupisnark at 05:16 AM on 10 August 2019Models are unreliable
MA Rodger @ 1129 and @1119
I asked Dr. Christy by email about the figures and he said: “ The units in the “atmosphere” are joules, not w/m^2. I had sent a correction … but it didn’t make the publication. “
”The 6 trillion is the number of joules in the ocean column below the surface.”
“However, the 0.5 is still very small compared to the fluctuations of the 100 units or so in the other flows of energy - the critic …misses the point. Indeed the response of the atmosphere (from measurements) indicates the atmosphere loses heat readily to space with … extra forcing. The 54 million joules is not being retained in the system each year as the critic implies.” -
cstrouss at 03:42 AM on 10 August 2019There is no consensus
Eclectic, I'm 100% in favor of conservation and a change-over to renewables as they become more economically feasible... more importantly I advocate serious investment in research to hasten that process. That is not an issue.
The issue is radical transformations that have been proposed like "the Green New Deal," which would have a devastating effect on low income people like myself, who will not be able to afford used electric vehicles for another decade or two. And it would have ZERO direct affect on AGW, given the logarithmic nature of the greenhouse affect and the number of people receiving electrification for the first time.
So I think it is important to view it as a long-term issue, that will necessarily involve innovation and mitigation of climate changes that cannot be avoided.
But as I said, that is all off-topic for this thread. This is about the consensus that AGW exists, not about the magnitude or solutions.
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Eclectic at 01:50 AM on 10 August 2019There is no consensus
Cstrouss , you give the strong impression you are not really interested in the climate science or the scientific consensus.
Are you interested in the consensus of the world's leading economists — which is that the cost of not taking action against AGW is far, far higher than the cost of phasing-in "renewables" to replace fossil-fuels.
It is grossly alarmist to represent that "renewables" change-over as the immediate and complete restructure of our social and economic systems . . . don't you think ?
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cstrouss at 01:20 AM on 10 August 2019There is no consensus
Michael: Seriously, you're pointing to a 16 year old Swedish actress as a source of information? Why not that kid from Titanic? He made a movie about climate, too.
I've actually answered my own question now, as I'm learning to use this site, and you got the consensus very wrong. The "advanced" tab gives the actual proposition: "Surveys of the peer-reviewed scientific literature and the opinions of experts consistently show a 97–98% consensus that humans are causing global warming."
Most of the IPCC signatories don't even agree with the entire report. So the IPCC report is not the consensus.Also, it's wrong to suggest that everyone who isn't a full bore alarmist is an oil industry shill. If it's all about bias, let's not forget that Gore became extremely wealthy with his "post-carbon" portfolio, but his profit motive does not invalidate his arguments.
As far as an indisputable expert who I think is reasonably unbiased and presents a non-alarmist position, my first thought would be to point to Cliff Mass at University of Washington.
So then there are deeper questions... What can realistically be done to slow or mitigate AGW, given the global political implications, the millions of people rising out of poverty, and the logarithmic nature of the greenhouse effect.. but that is not the topic for this thread.
The consensus being discussed in this thread is clear... AGW exists, which is a rather trivial conclusion... so I will search elsewhere on the site to see if anyone is diving into the more complicated and practical issues.
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One Planet Only Forever at 01:20 AM on 10 August 2019Can Land cause Climate Change? (new IPCC report)
"...we have to learn to protect our land from ourselves."
Humanity has to figure out how to correct the developed harmful aspects of systems and cultures to protect its future from the harmful results that can be expected to be produced by pursuits of status in competitions for popularity and profit.
It is cheaper and easier to act more harmfully and less sustainably for as long as it can be gotten away with.
All of the Sustainable Development Goals have been identified for Good Reason. They all need to be achieved and improved on, not just the corrections of land use and climate impacts.
And the 1987 UN report "Our Common Future" (a report that was the result of the continuation of global efforts to improve awareness and understanding of the requirements for the future of humanity that had produced the 1972 Stockholm Conference Report and continues with the IPCC and similar efforts to improve global understanding) accurately identified the reason Global Leadership (the winners of competitions for popularity and profit) fail to act in ways that would raise awareness of those goals and prioritize the achievement and improvement of those goals:
"25. Many present efforts to guard and maintain human progress, to meet human needs, and to realize human ambitions are simply unsustainable - in both the rich and poor nations. They draw too heavily, too quickly, on already overdrawn environmental resource accounts to be affordable far into the future without bankrupting those accounts. They may show profit on the balance sheets of our generation, but our children will inherit the losses. We borrow environmental capital from future generations with no intention or prospect of repaying. They may damn us for our spendthrift ways, but they can never collect on our debt to them. We act as we do because we can get away with it: future generations do not vote; they have no political or financial power; they cannot challenge our decisions.
26. But the results of the present profligacy are rapidly closing the options for future generations. Most of today's decision makers will be dead before the planet feels; the heavier effects of acid precipitation, global warming, ozone depletion, or widespread desertification and species loss. Most of the young voters of today will still be alive. In the Commission's hearings it was the young, those who have the most to lose, who were the harshest critics of the planet's present management."And the Propaganda Model presented by Edward S. Herman and Noam Chomsky in 1988 in the book "Manufacturing Consent" explains how harmful resistance to correction can be expected to fight to Defend undeserved Winning of Status.
The real problem is the undeserving among the wealthy and powerful and the way that Good people among the wealthy and powerful have been struggling to get support to correct their harmful Peers. Those helpful ones among the Winners struggle to win popularity contests because of the mechanisms identified by the Propaganda Model. They also struggle because as Jonathan Haidt has identified in "The Righteous Mind", many people will allow Interests Other than the fundamental ethical/moral value of 'Helping Others / Not Harming Others' to compromise how they evaluate the merit or value of actions. Many people will say they like actions to reduce climate impact but will still allow Other Interests to lead them to choose to vote for leaders who have a history of resisting such corrective actions.
The aspects of the story-telling systems that are influenced by, or harmfully governed by, interests that are contrary to achieving and improving on the SDGs are the reason so many people have inadequate and incorrect awareness and understanding of what is actually going on, and why many people who do understand what is going on become supporting players in the status quo systems contrary to the understood corrections required for the benefit of the future of humanity.
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michael sweet at 22:16 PM on 9 August 2019There is no consensus
Cstrouss;
There are different measures of the consensus but Cook et al used the IPCC reports. Since these are scientific reports that have been accepted line by line by all nations in the world they are a god pace to start. Many people feel that they are too conservative but deniers say scientists are all alarmists.
The most recent IPCC report says that we have only 12 years from January 1, 2018 to reduce emissions to zero if we want to limit waring to 1.5C. For that we have a 66% chance of keeping warming less than 1.5C. Already we have severe heat waves: over 75,000 hospitalized in Japan alone. Half of the Great Barrior reef is dead. Unprecedented floods in the US this year have seriously lowered food production. If we succeed, little action has been taken as yet, we still have a 33% chance of greater than 1.5C.
10 years ago I wondered if I would see the effects of climate change in my lifetime (I am currently 60). Now we see terrible floods and heatwaves. Houses and towns are flooded by record rainfall and affected by sea level rise. Many migrants coming to the US are fleeing AGW caused drought. Gore underestimated the problems in his movie. The changes currently at 1C are dramatic. How bad do they have to get before you become concerned?
Watch some of Greta Thunbergs talks on line. She speaks clearly about the science and does not pull punches. As she says, this is an emergency and shoud be treated as such.
Your suggestion that there are two sides is inaccurate. One side is what people who have studied climate for 100 years have learned and the other is what fossil fuel executives tell you. One side only cares about what will happen to their chilldren and the other only cares about their bonus this quarter. Who do you trust?
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cstrouss at 21:44 PM on 9 August 2019There is no consensus
Please forgive me if this sub-issue has been covered already... I read the first few pages where it was being discussed without resolution, and in the last few pages it is not mentioned.
But what exactly is "the consensus"? That the AGW hypothesis is true and it will have increasing implications on global weather patterns? Or that there it is a catastrophic situation and human must immediately and completely restructure our social and economic systems if the species is to survive?
In some of the arguments I've read so far, the believers seemed to be defending the former, and the skeptics were challenging the latter.
In the previous post (sorry, I don't know how to do that thing that references it yet) Eclectic seemed to criticize anti-AGW propaganda films masquerading as information, yet the same critiques could be made of the propaganda films from the other side, like Gore and DiCapprio's popular films, full of dramatic music and hyperbole.
I find it surprising that any intelligent and well meaning people still take the position that AGW is a complete hoax, but there is certainly a huge space for reasonable debate on the costs and risks of various strategies to reduce it or mitigate the damage.
Furthermore, I suggest it is the fact that so many people are taking a rather extreme alarmist position (if we don't do something radical in the next xyz years, we're doomed!) that make many other people rebel, and say obviously that's ridiculous, I think you're making the whole thing up.
It really is a thorny problem, considering the vast number of people now coming out of poverty, and having access to electricity and other technologies for the first time. And I see no recognition of the logarithmic nature of the greenhouse effect, which makes the political problems almost insurmountable.
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TVC15 at 10:20 AM on 9 August 2019Climate's changed before
Ops I meant when scientifically illiterate people make false staements...
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TVC15 at 10:16 AM on 9 August 2019Climate's changed before
@ 772 Daniel Bailey
For my small contributions, you are most welcome.
Daniel, your contributions have been an enormous help to me...nothing small about them! I am grateful to each person here who responds to the things I post as I've learned so much from all of you!
@ 771 MA Rodgers
Well, let that be a lesson for you!!
Denialism isn't logical. It turns folk into swivel-eyed loons.I agree! I've come to realize that there is no point in discussing science with people who are anti-science or not literate in science. It's a huge waste of my time! If they are literate in science but want to learn then that's a different scenario and I feel happy helping them understand scientific concepts.
However when scientifically liberate people make false statements about science such as the climate deniers do I feel it's a duty to a certain point to expose their misinterpretations or myth spreading lies.
You guys have helped me to better do that!
Thank you!
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One Planet Only Forever at 09:07 AM on 9 August 2019The consensus on consensus messaging
nigelj @8,
I agree with considering that a large portion of the global population is seriously addicted to fossil fuels (and many other unsustainable harmful popular and profitable developments). The 1972 Stockholm Conference and efforts since then that have produced many things, most recently the Sustainable Development Goals and the related IPCC reports, have strengthened the understanding that many of the developed socioeconomic-political systems have been making unsustainable and harmful activity popularity and profitability, and making correcting the problem more challenging as more people become more addicted, with more undeserved perceptions of status to lose.
And the interventions required to help break any addiction require a person to admit they have failed to protect themselves from becoming harmfully addicted.
The real trouble-makers are the Pushers, the people who continue to try to keep people harmfully addicted, try to delay the improvement of awareness and understanding because it would be contrary to their interest in maintaining their undeserved status. The Pushers are among the wealthiest and most powerful. Not all wealthy and powerful people are Harmful Pushers of unsustainable addictions, but the nastiest of the wealthy and powerful have many ways to get other people to 'admire and excuse them and tell nice but totally made-up stories about them' (and attack anyone who tries to correct that desired perception).
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nigelj at 07:03 AM on 9 August 2019The consensus on consensus messaging
OPOF @6, if I had to reduce the climate issue down to its essence, the basic issue is the world is addicted to oil. It varies of course person to person, country to country, organisation to organisation, and some are more in denial about it than others. But you take the sum total of all the complexity of the issue, the resistance to change and the motivations to hold onto status, I think it boils down to an addiction. It sure has the characteristics of an addition, and the addicts go into denial and justification like any addicts. Not saying I'm entirely immune, but I have always been able to step back and see things for what they are.
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nigelj at 06:54 AM on 9 August 2019The consensus on consensus messaging
BaerbelW, yes I was looking at the list of references, not the table. Working now. Sorry about that.
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One Planet Only Forever at 03:10 AM on 9 August 2019The consensus on consensus messaging
My efforts to constantly improve my awareness and understanding of what is going on have developed a personal understanding (open to improvement by the presentation of Good Reason to change it) that, to limit the amount of harm done by pursuits of status (power, popularity or profit), the acceptability, merit, or value of actions must be based on the helpfulness of the actions to the development of sustainable improvements (benefits for the future of humanity including benefiting those yet unborn in the distant future). The Sustainable Development Goals are a robust basis for determining the proper value or merit of actions. They include Climate Action Goals which are directly associated with the IPCC actions and the Paris Agreement and their constant improvement.
Of course, improving awareness and understanding of the climate science consensus is not the only required helpful action. However, it is undeniably a helpful action (no scientific investigation basis required to confirm that it is helpful). And it is not harmful to the achievement of the required corrections of developed human activity. But it undeniably will face unjustified resistance from people who deserve to lose perceptions of status that have been obtained through harmful unsustainable actions.
Similarly, putting a significant surcharge onto CO2 emissions from fossil fuels is not the only helpful corrective action. And all of the Sustainable Development Goals need to be achieved not just the Climate Action Goal.
There is undeniably a diversity of resistance to correction of many aspects of the developed status quo, particularly resistance to correcting incorrectly developed perceptions of 'status' and the related 'stories made-up, and made popular, to defend the status quo from being questioned and corrected'.
Attempts to argue against efforts to improve awareness and understanding of the consensus of understanding regarding climate science and the related impacts of human activities beg an explanation. A well reasoned consideration of the issue, without a rigorous science investigation basis (abductive reasoning applied to best explain what is observed to be going on), should conclude that such an action is helpful, not harmful, to efforts to increase the rate of correction of developed human beliefs and related harmful unsustainable activities. That leads to fairly obvious questions:
- What is the reason for criticism of efforts to helpfully improve awareness and understanding?
- Are the critics attempting to limit the rate of improvement of awareness and understanding of the required corrections of developed popular and profitable, but undeniably unsustainable and harmful, human activity?
- Are the critics trying to defend unjustified perceptions of status obtained by some members of current day humanity via harmful unsustainable actions?
Undeniably, undeserving wealthy powerful people have many ways to effectively influence the stories that get told, how they are told, and how prominently they are promoted. The Propaganda Model (PM) developed by Edward S. Herman and presented in “Manufacturing Consent” in 1988 (with assistance from Noam Chomsky), predicts that powerful interests are able to significantly influence the people who tell stories to the population - manufacturing the stories that become common beliefs or understandings. It predicts that part of the attack on the climate science identification of corrective actions would be restricting the opportunity for reward or positive recognition of any promoter of the improved understanding, including unjust attacks on the character of such promoters. That type of pressure, or the awareness of its potential to be applied, could make very smart people question the merit or value of promoting the climate science consensus.
The PM also predicts that the resistance to the efforts to improve awareness and understanding that is contrary to the interests of the powerful in the developed status quo in Free Market Capitalism driven cultures would include claiming that the corrective actions are Socialist plots (or communist or terrorist or any other developed label that can be successfully unjustifiably applied in efforts to maintain or prolong stories, beliefs and perceptions that are actually undeniably unsustainable because they are harmful to the future of humanity).
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SirCharles at 23:20 PM on 8 August 2019The consensus on consensus messaging
Good summary. That's why The Consensus on Anthropogenic Global Warming Matters ...
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nigelj at 06:30 AM on 8 August 2019The consensus on consensus messaging
BaerbelW, hovering the cursor over the authors names doesn't do anything.
Moderator Response:[DB] Were you perhaps looking in the References section? Hovering over the names in the table produces the stated effect, at least for me.
[BW] Do you have the Glossary active for "Beginner level" definitions as explained in the blog post I link to? If yes, you should see dotted underlines for the author name(s) and many other terms throughout the blog posts and rebuttals. If not, try to refresh the page and if they still don't show up, please send us an email to let us know your particular browser & OS-combination. We'll then try to replicate it.
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RBFOLLETT at 04:57 AM on 8 August 2019The consensus on consensus messaging
So let’s end this Crisis and have a public debate on the subject and once and for all shut up all the Deniers. In fact I don’t think there has ever been any debate, let alone a public one, between the Global Warming Scientists and the Denier Scientists so maybe the public should actually get to see both sides of the Debate. And let’s be specific and not try to muddy the waters, “How Much Does Increased CO2 Levels In The Atmosphere Contribute To Global Warming”. And let’s make it clear that “THE DEBATE” that has been supposedly over forever, only ever happened within the Global Warming camp and the new Debate will actually present BOTH sides to the argument.
Skeptical Science asks that you review the comments policy. Thank you.
Moderator Response:[DB] The vast majority of what you wrote is better-suited for other posts on this forum, not this one. Should any wish to respond, please respond on one of those more appropriate posts with a redirect here. Thanks.
Please note that posting comments here at SkS is a privilege, not a right. This privilege can and will be rescinded if the posting individual continues to treat adherence to the Comments Policy as optional, rather than the mandatory condition of participating in this online forum.
Moderating this site is a tiresome chore, particularly when commentators repeatedly submit offensive or off-topic posts. We really appreciate people's cooperation in abiding by the Comments Policy, which is largely responsible for the quality of this site.
Finally, please understand that moderation policies are not open for discussion. If you find yourself incapable of abiding by these common set of rules that everyone else observes, then a change of venues is in the offing.Please take the time to review the policy and ensure future comments are in full compliance with it. Thanks for your understanding and compliance in this matter.
Off-topic snipped.
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Mal Adapted at 02:43 AM on 8 August 2019Climate change made Europe’s 2019 record heatwave up to ‘100 times more likely’
Following last year's lethal high temperatures in Japan, it's been another summer of record highs for them. As of today:
57 people died and more than 18,000 were taken to hospital in the space of a single week as Japan grappled with a powerful heat wave.
...
Last month, more than 80 people died in a heat wave where temperatures climbed above 40 C (104 F) in parts of the country.
Then temperatures reached a record 41.1 C (105.8 F) according to Kyodo News, prompting Japan's Meteorological Agency to issue a warning that the heat posed a "threat to life."
I'm finding little about Japan's recent heat waves in US meejuh. Lots more about Europe's, for some reason.
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Daniel Bailey at 00:54 AM on 8 August 2019Medieval Warm Period was warmer
Caution needs to be exercised when possibly over-interpreting local growing conditions experienced for periods of time less than a century. Extrapolating them to say anything about global conditions is usually a waste of time.
For example, while England had 42 vineyards at the time of the Domesday Book, as is well known, there are now nearly 400 commercial English vineyards today. So the climate today in England is much more conducive to wine-making than during the Roman occupation of England.
"It is generally agreed that the Romans introduced the vine to Britain. It has also been inferred that the climate in Britain at that time was warmer. At the end of the first century AD, however, the writer Tacitus declared that our climate was “objectionable”, and not at all suitable for growing vines.
Today, there are vineyards in nearly every county of England and Wales, and there are vines now planted in Scotland. Much of the acreage and vineyards lie in the southern part of England, and more specifically Kent, Sussex, Surrey and Hampshire. Those few hundred acres first planted has now grown to over 5,000. In the last ten years alone, the acreage planted has more than doubled, and nearly tripled since 2000. Last year, around 1 million vines were planted – the highest planting in a single year, and perhaps a higher volume is set to be planted in 2018. All of this will lead to some substantial increases in production."
By 1977, there were 124 reasonable-sized vineyards in production – more than at any other time over the previous millennium. The website of the English wine producers suggests that at present the extent of vineyards in Britain probably surpasses that of the Medieval Warm Period between circa 900 AD to 1300 AD.
Be especially wary of those claiming the Vikings grew grapes in Greenland:
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Eclectic at 23:40 PM on 7 August 2019Medieval Warm Period was warmer
Sgbotsford @254 ,
check the video (above) and the graph of sea-level changes ~ the sea-level by itself indicates that the MWP had a temperature rise which was slow and slight, and was not from worldwide (multi-regional) warming. OTOH the current warming is clearly not simply a regional matter ~ sea-level is rising fast and still accelerating, major ice-melting is occurring. And the fundamental origin for the warming is clearly a very different matter.
Today vs MWP is such an apples & oranges comparison, that we cannot draw any useful prediction from the MWP event (quite apart from the question of magnitude inequality).
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michael sweet at 23:40 PM on 7 August 2019Models are unreliable
Postkey,
That is a very discouraging link. We will all have to work harder to get change adopted as soon as possible.
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BaerbelW at 22:18 PM on 7 August 2019The consensus on consensus messaging
For those of you who'd like to read any of the studies in the list, please hover your cursor over the author name(s) shown in the table. We've added all of the references to our glossary and while doing that found most of the full papers either on the journal website or a freely available PDF elsewhere.
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sgbotsford at 21:09 PM on 7 August 2019Medieval Warm Period was warmer
Ok. The MWP globally was a blip, possibly little more than noise.
* How large was it regionally?
I've seen mentions of growing grapes in Germany some 200m higher than before. Grapes in England. Etc. Seems a large effect for 1 degree.
* To what extent can the changes that occured during the MWP be used as a predictor of the types of changes our current warming will cause.
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Postkey at 18:25 PM on 7 August 2019Models are unreliable
The 'models' have been 'improved'?
“… Incredibly, at least eight of the latest models produced by leading research centres in the United States, the United Kingdom, Canada and France are showing climate sensitivity of 5°C or warmer.
When these results were first released at a climate modelling workshop in March this year, a flurry of panicked emails from my IPCC colleagues flooded my inbox."www.themonthly.com.au/issue/2019/august/1566136800/jo-lle-gergis/terrible-truth-climate-change
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nigelj at 17:40 PM on 7 August 2019The consensus on consensus messaging
The fact that research shows that communicating consensus studies to the public has a positive effect should come as no surprise. Just look at the deniers tactics, and they have years of experience delaying action on tobacco etc, so they know what works without needing research on the matter:
"Voters believe that there is no consensus about global warming with the scientific community. Should the public come to believe that the scientific issues are settled, their views about global warming will change accordingly. Therefore you need to continue to make the lack of scientific certainty a primary issue in the debate, and defer to scientists and other experts in the field.” (Frank Luntz)
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nigelj at 10:45 AM on 7 August 2019Climate change made Europe’s 2019 record heatwave up to ‘100 times more likely’
Speaking of New Zealand, which has been mild for winter, we are however expecting an unusually large and freezing cold low pressure centre from the antarctic air mass next week. I'm wondering if that might have a climate change fingerprint on it, as it is related to the jet stream I think.
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scaddenp at 08:52 AM on 7 August 2019Climate change made Europe’s 2019 record heatwave up to ‘100 times more likely’
Ditto for New Zealand
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uncletimrob at 18:28 PM on 6 August 2019Climate change made Europe’s 2019 record heatwave up to ‘100 times more likely’
It's not just Europe apparently - read an article that said that last month is one of the warmest July's in Brisbane, Australia.
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scaddenp at 07:12 AM on 6 August 2019Models are unreliable
Is someone claiming that models cant be improved? There are numerous problems with the models - the range of sensitivies; lack of decadal level skill; cloud predictions; terrible regional skill; - the list goes on and on. And funnily enough a lot of effort goes into improving them especially as computer power improves.
However, none of the issues in any way supports inaction on climate nor challenges the fundimentals of climate theory. Furthermore, the models have demonstrable skill at climate level prediction. (See the IPCC chapter on model evaluation). For all their warts, they remain the best tools we have for predicting future climate. If you arent comfortable with the model skill, what are you proposing as an alternative?
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Daniel Bailey at 06:29 AM on 6 August 2019Just how ‘Sapiens’ in the world of high CO2 concentrations?
Ancillary to the above comment (but not necessarily in approval of it), the paper by Jacobson et al 2019 is here.
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amillevo at 05:56 AM on 6 August 2019Just how ‘Sapiens’ in the world of high CO2 concentrations?
I registered just to make this comment. I agree with many of the earlier comments - this is a a very problematic post. It would be prudent to remove anything associated with the Robinson article. It is clearly not a peer-reviewed work - regardless of its stated affiliation. Leaving stuff like this up is not good for SkepticalScience. BTW, there is a very relevant July 2019 review article in Nature Sustainability, "Direct human health risks of increased atmospheric carbon dioxide" Jacobson, Kler, Hernke, et. al.
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scaddenp at 09:28 AM on 5 August 2019Nuclear testing is causing global warming
yhwhzson - the purpose of the article is to demonstrate that the heat from nuclear testing is not the cause of global warming. it is written directly to rebuff the myth in the title. Other environmental impacts are "out of scope" for this website but does not mean that they are not important.
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