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michael sweet at 05:31 AM on 7 August 20172017 SkS Weekly Climate Change & Global Warming Digest #31
Tom13,
Yes, the author is claiming that in 2050 the average year will have as many days over 105F as the record year with the most days that hot in the past. Some years will be higher and some wil be lower (for a little while). You are comparing a record year (one that stands out as very high in the record) to the average year in the projection. The current average looks to me to be about 3 days per year. The hot years you mention will be a substantial fraction of those days. When the average number increases that much it will seriously affect plants and animals.
In summary: there is a difference between an average and a record.
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Tom13 at 04:28 AM on 7 August 20172017 SkS Weekly Climate Change & Global Warming Digest #31
The story of the week predicts 25 days of heat over 105f by the year 2025.
Is the author of the story unaware that DFW had 28 days over 105 in 1980,. DFW also had 17 days over 105 in 2011. In summary, the author is predicting that is will take 40+ years for dfw to experience what the DFW metroplex experienced in 1980.
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Cmtg729 at 01:44 AM on 7 August 2017It's methane
The sources that explain the rise of methane in the atmosphere, its dangers, why graphs need to updated to explain escaping methane from fracking pipes:
Www.thinkprogress.org/methane-leaks-erase-climate-benefit
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ubrew12 at 23:08 PM on 6 August 20172017 SkS Weekly Climate Change & Global Warming News Roundup #31
Paul D@2 said: "giving an (false) emphasis to the... years at the end of the sequence" You mean the present? As creatures caught in time, we view the present more emphatically than the past. The animation recognizes this, and compensates for it.
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MA Rodger at 14:19 PM on 6 August 20172017 SkS Weekly Climate Change & Global Warming News Roundup #31
nigelj @4,
It is perhaps best to say that the animation "stops" at the end and as you point out, that the slowing begins at about 1980 where the rate of passing decades drops from every two seconds to every three seconds. The rate further drops again from 2000 where it drops to a decade in four seconds. This post-2000 slowing could be argued, less as "an (false) emphasis to the warmer few years at the end of the sequence" and more as suggestive of a 'false slowdown' in the warming - and that is something usually getting a scientific thumbs-down when it occurs, it being not "scientifically accurate."
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nigelj at 13:22 PM on 6 August 2017Underground magma triggered Earth’s worst mass extinction with greenhouse gases
Digby Scorgie just adding a further comment, yes we do handle large temperature fluctuations day to day, through adaptations, through necessity, but long term changes are different in substance, and its our choice whether we reduce emissions, or chance it and hope things work out. Or so it seems to me.
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nigelj at 13:13 PM on 6 August 2017Underground magma triggered Earth’s worst mass extinction with greenhouse gases
Digbie Scorgie @9, I dont think anyone is fundamentally disagreeing with you or missing the point. Maybe just looking at other aspects of it.
I mean you are definitely right. I would put it this way. Plus or minus 4 degrees both equals very significant global scale problems. Just one example, both scenarios could drive a lot of climate refugees, the difference being that warming could be faster than a cooling period leading to an ice age, so harder for target countries to absorb, so more potential political and practical problems.
But neither scenario is great, and creates a domino effect of practical, political and social problems that will challenge a stable global order.
We have evolved during about 10,000 years of relative climate stability and it enabled development of settled farming. I dont like the way we are altering stability, too many unknowns and it's hard to see many up sides.
I have a book called Adventures in the Anthropocence which deals with some of this, but haven't read much of it yet.
Humans are adaptable creatures, but not infinitely so, and adaptation requires effort that might be better spent elsewhere.
That's my two cents worth anyway. It's an extremely interesting issue.
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nigelj at 11:06 AM on 6 August 20172017 SkS Weekly Climate Change & Global Warming News Roundup #31
The animation doesn't really slow down just at the end. It appears to me to start slowing down from about 1980.
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Daniel Bailey at 08:48 AM on 6 August 20172017 SkS Weekly Climate Change & Global Warming News Roundup #31
"giving an (false) emphasis to the warmer few years at the end of the sequence"
What, you mean the warmest years on record?
How's this, then, for scientific accuracy?
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Digby Scorgie at 08:23 AM on 6 August 2017Underground magma triggered Earth’s worst mass extinction with greenhouse gases
I think people are missing my point. We routinely deal with quite a wide range of temperatures in our lives — a few tens of degrees. But when it comes to average global temperatures it looks as if plus or minus four degrees (or even less) is about the limit for an "organized global community". That's a remarkably narrow range.
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Paul D at 07:56 AM on 6 August 20172017 SkS Weekly Climate Change & Global Warming News Roundup #31
Regarding the animation in the video.
It appears that the animation slows down at the end giving an (false) emphasis to the warmer few years at the end of the sequence. Not good IMO.
A visualisation shouldn't need to to that, especially if it supposed to be scientifically accurate.
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ubrew12 at 02:25 AM on 6 August 20172017 SkS Weekly Climate Change & Global Warming News Roundup #31
The link to "Earth to warm 2 degrees Celsius by the end of this century, studies say" by Ashley Strickland, CNN, isn't working. I found it here.
Moderator Response:[JH] Glitch fixed. Thanks for bringing it to our attention.
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Tom Dayton at 00:38 AM on 6 August 2017CERN CLOUD experiment proved cosmic rays are causing global warming
August 2017 commentary article by J.R. Pierce in J. of Geophysical Research, Atmospheres--"Cosmic rays, aerosols, clouds, and climate: Recent findings from the CLOUD experiment." Abstract:
The Cosmics Leaving OUtdoor Droplets (CLOUD) experiment was created to systematically test the link between galactic cosmic rays (GCRs) and climate; specifically the connection of ions from GCRs to aerosol nucleation and cloud condensation nuclei (CCN), the particles on which cloud droplets form. The CLOUD experiment subsequently unlocked many of the mysteries of nucleation and growth in our atmosphere, and it has improved our understanding of human influences on climate. Their most recent publication [Gordon et al., 2017] provides their first estimate of the GCR-CCN connection, and they show that CCN respond too weakly to changes in GCRs to yield a significant influence on clouds and climate.
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Swayseeker at 00:49 AM on 5 August 2017Study finds human influence in the Amazon's third 1-in-100 year drought since 2005
A while ago I spent a lot of time drawing graphs with land air temperatures and sea temperatures featured. Usually, when sea temperatures are higher than land air temperatures there is more rain (with my studies anyway). 1) When land air temperatures are higher than sea temperatures and the air blows to sea, the sea cools it down. This means that water may even condense, but the air becomes more near saturation point and does not readily take up moisture from the sea. 2) If the air is cooler than the sea then the sea warms it up, RH drops and the air readily takes up moisture. In case 2 the air has more moisture than it started with and when it blows back with sea breezes, etc, then it can deposit its moisture as rain.
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nigelj at 13:47 PM on 4 August 2017Underground magma triggered Earth’s worst mass extinction with greenhouse gases
Driving by, yes glacial cycles do happen very slowly over several thousands of years, and the next one is predicted somewhere from 15,000 - 50,000 years time, triggered by a known planetary cycle. I confess I like skiing as well.
However ice sheets covered more than just the polar regions, and covered a lot of canada etc. The following includes maps of the last ice age peak around14,000 bc compared to today:
However as you say it was a slow process, and new coastal land was exposed. Its easier to adapt to that sort of scenario. Also theres a belief that the warming already locked in will reduce the worst aspects of the next ice age.
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scaddenp at 13:29 PM on 4 August 2017Underground magma triggered Earth’s worst mass extinction with greenhouse gases
While obviously temperatures need to be range to support photosynthesis, but the real issue for extinctions etc is rate of change rather than absolute temperatures. Our civilization has an awful lot of assets that cant move quickly. Local disruptions to agriculture cause a lot of problems. Disruption on a global scale is really testing.
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nigelj at 13:27 PM on 4 August 2017Study finds human influence in the Amazon's third 1-in-100 year drought since 2005
Large areas are at the very least going to be rather inhospitable. But I suspect a lot of the wealthy classes are likely thinking they, and their children can buy their way out of climate problems, and they control the agenda on whether emissions are cut. Thats your big problem, and it's 100% a political problem.
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DrivingBy at 12:23 PM on 4 August 2017Underground magma triggered Earth’s worst mass extinction with greenhouse gases
"Humanity doesn't have much wiggle room!"
I'm not a climatologist, but to my limited understanding glaciers advance rather slowly (thus the phrase 'glacial pace'). Further, as glaciers cover the near-polar latitudes, the sea retreats. The land exposed is sunnier and richer than the land covered, so it's a net gain in liveability, or so I'd guess.
Besides that, I like ice. The skiing, skating and ice-sailing would be awesome!
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wili at 11:52 AM on 4 August 2017Study finds human influence in the Amazon's third 1-in-100 year drought since 2005
Soooo, large parts of South America are likely to become basically uninhabitable. In other news, it looks like the same is going to be true of major parts of densely populated South Asia.
Deadly heat waves projected in the densely populated agricultural regions of South Asia
Suddenly the Wallace-Wells piece from the NYMag a while back doesn't seem that out of line...
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Digby Scorgie at 11:25 AM on 4 August 2017Underground magma triggered Earth’s worst mass extinction with greenhouse gases
To add to my comment above, there is this statement by Dr Kevin Anderson to the effect that "four degrees is inconsistent with an organized global community". The deniers have no reason not to worry.
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Digby Scorgie at 11:20 AM on 4 August 2017Underground magma triggered Earth’s worst mass extinction with greenhouse gases
So an increase of 6 or 7 degrees gets us a mass extinction, whereas a decrease of about 5 degrees gets us an Ice Age. Humanity doesn't have much wiggle room!
To put it in context, then, the 2 degrees of Paris is about a third of a mass extinction and the projected 4 degrees by the end of the century is two-thirds of a mass extinction.
Oh, and you have to note, kmoyd, that under business as usual the temperature passes through 4 degrees at the end of the century on its way to 6 degrees, which is a full mass extinction.
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scaddenp at 07:50 AM on 4 August 2017Study finds human influence in the Amazon's third 1-in-100 year drought since 2005
Hmm. I would say the effect of global warming on ENSO is unsettled science, and while current reviews (eg Huang and Xie 2015) favour more frequent El Nino and more extremes of both, I dont see support for a permanent El NIno. Given modeller concerns about how well models produce ENSO behaviour, I wouldnt jump to conclusions yet.
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Alexandre at 06:34 AM on 4 August 2017Study finds human influence in the Amazon's third 1-in-100 year drought since 2005
This paper based on climate models suggests that with further warming we should have a permanent El Nino-like weather behaviour, making the Amazon basin drier and the La Plata basin (further south) wetter.
On top of that, the forest cover is also important to bring water from the coast to the inner continent. (here, for instance)
We're inflicting damage on both fronts.
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nigelj at 06:17 AM on 4 August 2017Explainer: California’s new ‘cap-and-trade’ scheme to cut emissions
Swayseeker @3
Your idea is to plant palm oil trees in California to absorb CO2 and use this as carbon offset credits to make money.
This doesnt make much sense to me. Palm oil trees do not have special, particularly large abilities to absorb CO2.
California is currently intensively farmed, and a huge producer of fruits and crops and It wouldnt make much sense to replace this with palm oil trees. These existing crops have to be grown somewhere.
And I dont think there would be millions of acres just lying vacant just to plant palm oil trees. There may be steep, unused areas where more forests could be grown.
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MA Rodger at 06:09 AM on 4 August 2017Sea Level Isn't Level: Ocean Siphoning, Levered Continents and the Holocene Sea Level Highstand
JohnWChristensen.
You question @14 was "whether siphoning has been the only or major factor, as we have plenty of research indicating that ice sheets and glaciers have grown over the past 2-3 thousand years - until about 200 years ago. ... Therefore, it would seem reasonable to assume that growth in glacier and ice sheet volume since the holoscene high stand has caused a decline in mean sea level, and that also the ocean sea bed should have been lifting in response to the reduced ocean volume."
If we are talking "major" factors, there is but one. The highstand is the result of siphoning. The literature is still trying to nail down the timing of the final reductions in ice volumes (eg see Bradley et al 2016) which are greatly more significant than any increases in ice volume through the late holocene. Changes in sea level through recent millennia have been found to be very small. See for instance Kopp et al (2016) whose Fig1a looks like this:-
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Mike Evershed at 03:07 AM on 4 August 2017Temp record is unreliable
Sorry - should have added that I found the points about Berkley Earth starting from a sceptical position and the lower risk of confirmation bias around adjustments which are not theory breaking to be good ones.
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Mal Adapted at 03:00 AM on 4 August 2017Dangerous global warming will happen sooner than thought – study
Solely for the sake of clear thinking ;^), I'm back to respond to Tom Curtis's criticism:
In your first example of the use of "the tragedy of the commons" by an ecologist, that by Berger-Tal et al, they get the use wrong even by Hardin's sense. In Hardin's sense, the 'tragedy of the commons' involves over exploitation of a resource due to common ownership.
While I cited Berger-Tal et al. merely to demonstrate that 'Tragedy of the Commons' was a current term of art in Ecology and Evolutionary Biology as well as in Economics, TomC's specific criticisms may appear reasonable to non-specialists. This review article I just came across is more credible, from scientific metaliteracy if nothing else: DJ Rankin et al. 2007, The Tragedy of the Commons in Evolutionary Biology, Trends Ecol Evol 22 (12), 643-651.
I also wanted to respond to this argument of Tom's:
My point is that Hardin's use suggests that there is only one possible tragic result from use of the commons - something which is definitely false as shown by the tragic results of enclosure. In doing so it belittles the actual historical tragedy in favour of a hypothetical tragedy whose rhetorical use is to justify replicating the historical tragedy. That it has that rhetorical use does not mean it cannot, and has not been used by others in careful analysis.
I presume Tom is aware that Hardin wrote in 1998:
To judge from the critical literature, the weightiest mistake in my synthesizing paper was the omission of the modifying adjective "unmanaged."
Now, I have no personal motive to defend Garrett J. Hardin over anyone else in history, but I'm unwilling to speculate on what he was thinking in 1968. By his own words (30 years later, to be sure), he did not intend to say that the entire class of problems labeled TotCs, including global human population growth, could only have tragic endings. So why did Stephen M. Gardiner assert in 2001 that Hardin had said exactly that? (Paywalled, but this is from the first page):
In two celebrated and widely anthologized articles, as well as several books, the biologist Garrett Hardin claims (a) that the world population problem has a certain structure: it is a tragedy of the commons; and,(b) that, given this structure, the only tenable solutions involve either coercion or immense human suffering.
IMO Gardiner's argument is a straw man, illuminating his agenda more than Hardin's. Absent probative contrary evidence, we may assume even Hardin sincerely abhorred both coercion and immense human suffering. Regardless, he's not responsible for what he did not say, nor for what other people say he did. Would you have it any other way?
Summing up my position: it's evident that 'Tragedy of the Commons', as a term of disciplinary art for diverse, partially-overlapping classes of problems, is not widely considered offensive by Economists or Ecologists. Now that the term is established in both fields, efforts to replace it appear largely quixotic.
OTOH 8^D: some economists, Ostrom inter alia, have chosen 'Drama of the Commons' as equally mnemonic and more concise, by including non-tragic endings. Since April, I've been using it on appropriate bloggy threads, when I know my audience can unpack it. Ostrom's prestige may give it wings. I'll keep my eye on it 8^).
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Mike Evershed at 02:33 AM on 4 August 2017Temp record is unreliable
Thanks Guys. In view of the discussion above, I would agree that the global temperature record (sea and land) is the better measure, and because adjustments to the sea surface data rduce the long term growth trend and there are several groups working on the problem of past reconstruction, the risk of confirmation bias causing significant problems is small. That leaves the issue of "is the warming anthropogenic" (but that is for another thread and another time). Thanks especially for the courteous replies to what has been an attempt to genuinely explore the issue.
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One Planet Only Forever at 00:20 AM on 4 August 2017Explainer: How data adjustments affect global temperature records
Haze@7,
A nation that has developed a large population of people eager to live a life in Denial/Delusion has no future. It can only have perceptions of temporary regional popularity and profitability.
And humanity must have a future. So, to paraphrase John Stuart Mill in "On Liberty": The grown-ups on this amazing planet whose thoughts and actions are based on rational consideration of the best awareness and understanding of what is going on to sustainably correct/develop things for the better future of all of humanity (John Stuart Mill's "...moved by rational consideration of distant motives...") will have to act to protect the future of humanity by disappointing and angering those who have grown-up wanting to believe whatever they want to excuse what they want to get away with.
As John Stuart Mill stated in "On Liberty" (my inserted wording to apply it to a subset of humanity), “If (a) society lets a considerable number of its members grow up mere children, incapable of being acted on by rational consideration of distant motives, (that) society has itself to blame for the consequences.”
The unacceptability of burning fossil fuels, and the likely need for leadership to act to correct incorrect damaging unsustainable development in the marketplace, was internationally established in the 1972 Stockholm Conference.
The lack of leadership to address the problem was plainly pointed out in the follow-up 1987 "Our Common Future" which includes the following blunt statement about the failure of business and government leadership (because it is driven by popularity and profitability - my suggested understanding).
"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."The 2015 Sustainable Development Goals (and any future improvement of them made for Good Reason with new awareness and better understanding) clearly need to become the most popular (the highest level) measure of acceptability of the actions of leadership in business and government.
So what you are pointing out requires action by you directed at your leaders and your circle of influence. Climate scientists are continuing to expand awareness and improve the understanding of what is going on in their field. What their continued efforts have done is expose the fatal flaws of a system that is based on popularity and profitability allowing people to develop unsustainable delusions of prosperitry and opportunity.
The reality is that many of those who have tried to continue to develop on the unsustainable damaging pathways that can be regionally temporarily popular and profitable will suffer the greatest required change to their "incorrectly developed perceptions and beliefs" (easily perceived as a personal harm to be feared - but incorrect to be thought of that way).
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JohnWChristensen at 23:33 PM on 3 August 2017Sea Level Isn't Level: Ocean Siphoning, Levered Continents and the Holocene Sea Level Highstand
For the moderator: I am not questioning AGW or the present net mass loss situation in Antarctica or elsewhere.
My question was if the glacier and ice sheet growth until about 200 years ago have been considered in the sea level model, or if land ice volume of the period since the holoscene high stand was assumed to be constant?
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Swayseeker at 22:53 PM on 3 August 2017Explainer: California’s new ‘cap-and-trade’ scheme to cut emissions
Well California can be hot, but it is often dry and would not be considered to be like a tropical forest where oil palm trees can be easily grown. But yeseterday I found out that there are oil palm seeds suitable for colder and drier climates. Possibly with rain enhancement (see for example UAEREP on Facebook) and these seeds California could make a lot of money taking carbon dioxide out of the air by growing palm oil trees. See also https://www.facebook.com/groups/RainForDesertPalmOil/ for rain enhancement methods I do not want to repeat (posted before) and oil palm seeds for drier and colder conditions.
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JohnWChristensen at 21:35 PM on 3 August 2017Sea Level Isn't Level: Ocean Siphoning, Levered Continents and the Holocene Sea Level Highstand
Thank you for a great article Rob!
I have a question regarding the change in sea level since the holoscene high stand 5-6,000 years ago, as is referenced in this statement:
The fall in global sea level occured once glacial meltwater from the gigantic land-based ice sheets stopped and seawater was siphoned away to fill collapsing seafloor regions.
I question whether siphoning has been the only or major factor, as we have plenty of research indicating that ice sheets and glaciers have grown over the past 2-3 thousand years - until about 200 years ago:
Alaska - Wrangel glaciers increasing in four periods in past 2,300 years:
Norway - holoscene glacier max volume reached around 1750AD after minium reached about 6,000 years ago:
Antarctica - general ice sheet volume increase during holoscene. I know this NASA research is being contested with regards to current net volume change, but have not seen discussion to dispute that Antarctica ice sheet volume has grown during the holoscene overall:
In Greenland the now disintegrated Jacobshavn glacier was estimated to be about 2,000 years old by DMI, and research in the Alps as well as for southern hemisphere glaciers similarly indicate growth in most recent millenia now changing into retreat.
Therefore, it would seem reasonable to assume that growth in glacier and ice sheet volume since the holoscene high stand has caused a decline in mean sea level, and that also the ocean sea bed should have been lifting in response to the reduced ocean volume.
Has land-based ice volume changes since the holoscene high stand been considered for this model?
Best regards,
John
Moderator Response:[DB] "this NASA research is being contested...Antarctica ice sheet volume has grown"
Your linked NASA article from 2015 discusses Jay Zwally's research. This is NASA's (the employer of Zwally) current position on land-based ice sheet mass losses:
"Data from NASA's GRACE satellites show that the land ice sheets in both Antarctica (upper chart) and Greenland (lower) have been losing mass since 2002. Both ice sheets have seen an acceleration of ice mass loss since 2009." (Source: GRACE satellite data through August 2016)
Note that Zwally's data comes from a few locations in Antarctica, and not the entire continent (unlike GRACE). Zwally's data also ends in 2008 (also unlike GRACE).
Further, Zwally even warned that some might misrepresent his research.
Indeed, the latest research shows that losses on West Antarctica exceed gains in East Antarctica (gains in East Antarctica are 3 times smaller than found by Zwally's research).
(link to larger image)
Hot-linked and shortened URL's. -
Haze at 18:30 PM on 3 August 2017Explainer: How data adjustments affect global temperature records
Moderator @4 in my defence I did state the opening paragraph was from The Australian and then used inverted commas to delineate the opening paragraph from the Australian and although I did not give a link I did state the source. I will be more careful should the occasion arise in the future to ensure I abide by the rules.
OPOF@5
"What a person wants to believe is what they will believe and claim to be reality. If there is actual evidence/better understanding that contradicts their belief and they resist better understanding the matter then they are in deliberate Denial."
Your definition fits many of the commenters to The Australian and is why I believe that the report will gain traction with many readers.
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nigelj at 12:50 PM on 3 August 2017Temp record is unreliable
Confirmation bias. Of course there is always some risk of this, and its normal to look for evidence that supports an idea, but this doesn't dominate things. People are aware of the risk of confirmation bias, and contrary evidence will be thrust on people by other scientists wanting attention. Science has a habit of bringing all the evidence out in the open.
The point is the global land ocean temperature trend over the last 100 years has been adjusted down, and for sound reasons. This is strong evidence that confirmation bias has not corrupted the temperature data. I would suggest conclusive evidence for all practical purposes.
You would think this simple thing would end the debate on the issue, but no the denialists will rant on about it for decades and decades.
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scaddenp at 11:45 AM on 3 August 20172017 SkS Weekly Climate Change & Global Warming News Roundup #29
So what is the bet the US programme will accelerate when China and India have MSR on stream? India should commission a Thorium fast breeder to feed a convention nuclear plant later this year. I suspect China will the race to full Thorium cycle.
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DPiepgrass at 10:36 AM on 3 August 20172017 SkS Weekly Climate Change & Global Warming News Roundup #29
What happened to thorium reactors? They were supposed to solve all the usual nuclear problems.
@nigelj I've been following thorium & Molten Salt Reactors (MSRs) with interest, and my impression of the biggest problem is that it's hard to get investors - unlike renewables there are no subsidies for this, and it takes hundreds of millions of dollars to build and certify a prototype, legally acquire highly-enriched uranium to jump-start a thorium reaction, etc. A secondary problem in the U.S. specifically is that the NRC has to certify all reactors, and no one knows quite how the NRC will decide to regulate thorium/MSRs. Plus, anyone building a new kind of reactor has to pay for all the NRC's work. These factors create a "first-mover disadvantage" where no one wants to incur the expenses of being the first to build a Thorium reactor. Work is definitely moving along, but it's slower than it could have been, and the first reactors will probably be anywhere but the U.S.
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Tom13 at 09:11 AM on 3 August 20172017 SkS Weekly Climate Change & Global Warming News Roundup #29
http://www.pnas.org/content/114/26/6722
www.pnas.org/content/114/26/6722/suppl/DCSupplemental
www.pnas.org/content/114/26/E5021.extract
www.ncbi.nlm.nih.gov/pubmed/28630353
100% renewables powering the US by 2050 ? - I have provided likes to PNAS critique of Jacobson along with his response. I have to go with Rust on this one.
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nigelj at 09:04 AM on 3 August 2017Explainer: California’s new ‘cap-and-trade’ scheme to cut emissions
I tend to echo comments in 1 above.
California's efforts to cut emissions should be applauded of course. I think they are also correct to have a mix of policies aimed at this.
However I still have lingering doubts about emissions trading schemes. They make good theoretical sense of course, and worked for sulphate problems several years ago, but seem to have a history of political meddling relating to carbon emissions. This has sometimes lead to tradable credits dropping in value and becoming useless, and the whole scheme is based on these tradable credits having the exact right value.
The following article is a good critique and also promotes a revenue neutral carbon tax as being less susceptible to manipulation.
However Europe has had some problems with cap and trade, but also some reasonable results as well, so its not a simple thing.
However whatever system is used, for it to work it needs to be open, transparent, and easy to scrutinies any manipulation. Perhaps any cap and trading or carbon tax scheme should be run by a non partisan independent body to reduce politicans doing dubious politically motivated favours for preferred industries etc.
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John S at 08:19 AM on 3 August 2017Explainer: California’s new ‘cap-and-trade’ scheme to cut emissions
It’s good that California affirmatively resolved the uncertainty as to whether its carbon pricing would continue past 2020. At the same time it’s a disappointment they couldn’t do better. It was only last year, as reported by your Dana Nuccitelli in the Guardian, that California passed AJR 43, urging the national government to pass a revenue neutral carbon tax.
https://www.theguardian.com/environment/climate-consensus-97-per-cent/2016/aug/29/california-has-urged-president-obama-and-congress-to-tax-carbon .
And, earlier this year, there were reports that, under SB 775, CA was about to revolutionize climate policy by replacing cap-and-trade with something much better, closer to fee and dividend, as advocated for many years by James Hansen, Katherine Hayhoe and Citizens Climate Lobby, and, more recently, by the Climate Leadership Council.
https://www.vox.com/energy-and-environment/2017/5/3/15512258/california-revolutionize-cap-and-trade
Why would this have been so much better?
The key point is a commitment to increase carbon prices predictability, in perpetuity (in other words until they get the job done of eliminating fossil fuel burning). This means all (or most, see below re environmental justice), of the revenue must be given back to citizens as dividends; otherwise taxpayers, and the economy, will not tolerate the extra taxes.
To be clear, every Californian would have received rising dividends compensating for the drain on their budgets from rising prices.
The big hit, the home run, as you baseball fans would say, is that predictably ever-rising fossil fuel prices would energize innovation and increase the net present value, hence feasibility and chance of success, of all long-lead-time and long-life projects, e.g. changing some of your old steam district heating systems to modern low temperature hot water systems, thereby enabling use of non-fossil sources, building retro-fits and strategic changes in transportation and industry.
It would protect trade exposed industries and prevent “leakage” by border-adjustment taxes (BAT’s). This is much more selective than giving away allowances holus bolus, which is typical in cap-and-trade schemes, such as ours here in Ontario. (Just for fun, some of us are imagining Trump’s reaction if Canada enacts wide-ranging BAT’s against the US next year because we will have a national carbon price and the US probably won’t.)
SB 775 would not have allowed off-sets. I could argue both sides of that one, but would have thought the environmental justice groups would fight for it, having seen some of the terrible industrial urban landscapes down there. But these were the same people who sank a revenue neutral carbon tax proposal in Washington state, hence some special effort to help vulnerable communities would have been wise (better than grandiose plans for bullet trains anyway.)
Perhaps the main opportunity lost, as expressed by David Victor in the referenced article, is the positive, leadership impact on the rest of the word – because, yes, we were watching. -
One Planet Only Forever at 08:07 AM on 3 August 2017Explainer: How data adjustments affect global temperature records
Haze@#4,
I would argue that the following is a better understanding of the claim that Perception is Reality:
What a person wants to believe is what they will believe and claim to be reality. If there is actual evidence/better understanding that contradicts their belief and they resist better understanding the matter then they are in deliberate Denial.
Everyone cannot be free to believe whatever they want when there is independently verifiable evidence/experience related to the matter. Spiritual beliefs are one of the few items where everyone truly can be equally correct while having seemingly inconsistent beliefs (no matter how numerous or powerful a spiritual group of people claiming that their way of believing is the only correct one has become).
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scaddenp at 07:29 AM on 3 August 2017Temp record is unreliable
And further to my earlier comment, there is plenty of people out there with hostile views and, for fossil fuel companies where proposed climate action is a threat to shareholder value, the funds and scientific muscle to create their own homogenized temperature series. They could also challenge the papers that details the homogenization methods if they could find errors. The lack of any such papers would suggest that noone has found a real problem. I cant imagine Exxonmobile pushing a paper "the scientists were right" if they did such a study (and we know their scientists have looked). All we get is innuendo which sits fine for an audience with their own ideological biases seem to have shut down their critical faculties if they ever had them.
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kmoyd at 01:30 AM on 3 August 2017Underground magma triggered Earth’s worst mass extinction with greenhouse gases
is there any way to tell when during the increasing temperature rise the extinctions started. I'm concerned deniers will use the fact that the temperature rise was 6 degrees while our business-as-usual estimate is "only" 4.2 degrees means we don't have to worry.
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Eclectic at 21:38 PM on 2 August 2017Explainer: How data adjustments affect global temperature records
Haze @#4 ,
polar ice is melting away at 100's of Gigatons per year; temperate-zone glaciers are disappearing rapidly; sea levels are rising ever faster; global surface temperatures are setting new highs; and plants and animals are altering their behaviour accordingly.
That is reality.
Those who think "reality" exists only in their own minds — are, by definition, insane. They can attempt to resist reality for a while, but not in the long term.
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MA Rodger at 21:15 PM on 2 August 2017Temp record is unreliable
Mike Evershed @443.
Your quote concerns confirmation bias generally and is not specific to the scientific process. Nickerson (1998) 'Confirmation Bias: A Ubiquitous Phenomenon in Many Guises' does address things scientific (no mention of climatology) and a little more fully than he does witch-hunting. As I see this as off-topic, I will be brief.
The accounts given of Conservatism among scientists, Theory persistence, Overconfidence and Unity in science I would suggest apply to the AGW denialists rather than the AGW proponents. Science works hard to root out Confirmation Bias. I see no difficulty in taking on board an aberrant theory that would disprove AGW, but only if it has merit. AGW denialists cannot say the same for the science they attempt to overturn, science that does have merit. Yet they do have a role in science (but not in public), using their denialist viewpoint to rattle the cage, but in doing this they have failed to produce any aberrant theories that have any merit, so far.
Note that the examples given by Nickerson are about big issues that make-or break theories. (I should say here that I am not entirely happy with some of his accounts.) As the adjustments to global temperature series we discuss here do not lead to any make-or-break situations, I don't see there is a situation where confirmation bias would begin to operate. But looking from a denialist viewpoint, chipping away at the temperature record does assist the anti-AGW arguments, not least by spreading doubt over the entirety of all temperature records.
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scaddenp at 19:36 PM on 2 August 2017Temp record is unreliable
It is also extremely hard to understand quite point you are trying to make. It feels like a fairly desparate attempt to find a reason to be doubtful of the temperature record with no actual basis at all. Do you comment on JPL sites about the dark side of the consensus on gravity might result in satellites off course? Or complain that maybe it is okay to build houses on faultlines because after all the geological consensus on earthquakes might be subject to confirmation bias?
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scaddenp at 17:56 PM on 2 August 2017Temp record is unreliable
"however as all of them subscribe to the consensus view"
Um, this isnt politics. You arrive at a consensus you dont start with one. Also BEST was started by Muller as was skeptical of the record with Koch funding. Anthony Watts said “prepared to accept whatever result they produce, even if it proves my premise wrong.” That was until it confirmed the existing temperature records. So definitely not "all of them".
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Haze at 16:55 PM on 2 August 2017Explainer: How data adjustments affect global temperature records
My apologies I clearly did not make it clear what I was trying to demonstrate. The first part of my post was a cut and paste of the report in The Australian on Monday August 1.
The second partg was attempting, very badly it seems, to point out that despite the best efforts of SkS to disseminate the facts on AGW, it could not match the number of people who would read the piece in The Australian and possibly be influenced by it . As I wrote, perception is reality and for many readers that piece now may well be reality. Donald Trump by withdrawing from Paris has clearly shown just how well perception can serve to change reality.I hope that explains more clearly the rationale for my post and can only apologise once again for my inadequacies
Moderator Response:[JH] For future reference, please clearly designate direct quotes by explicitly stating and linking to the source and deliniating the material quoted with the use of quotation marks or the blockquote feature. Deliniating quoted material with itlaic font is also acceptable.
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Mike Evershed at 16:47 PM on 2 August 2017Temp record is unreliable
I am grateful for the thoughtful responses of site participants (posts 436 to 442). Michael Sweets reference to Zeke Hausfather's article was particularly helpful and I'm beginning to see some light at the end of the tunnel. It looks as though the "denialist" sites are mostly referencing either the land surface air temperature data where revisions to older data do increase the warming trend (but only moderately so) or the modern period adjustments where again they increase the trend (but only slightly so), while sites supporting the consensus focus on the either the sea surface record or the overall record including sea surface temperatures where the adjustments reduce the long term warming trend (and significantly so). As to the questions I have been asked - I don't dispute the climate is warming and I don't think the data adjustments represent fraud - but I am trying to get a handle on how reliable the consensus view is, and on this thread how reliable the warming data is. As to my concern about confirmation bias, I agree that the existence of different groups working on the data problems reduces the risk, however as all of them subscribe to the consensus view, and defend the anthropogenic warming hypothesis the risk of confirmation bias cannot be totally discounted.
To quote an expert in the field: "A great deal of empirical evidence supports the idea that the confirmation bias is extensive and strong and that it appears in many guises. The evidence also supports the view that onceone has taken a position on an issue, one's primary purpose becomes that of defending or justifying that position. This is to say that regardless of whether one's treatment of evidence was evenhanded before the stand was taken, it can become highly biased afterward." http://psy2.ucsd.edu/~mckenzie/nickersonConfirmationBias.pdf. Nickersons discussion of confirmation bias in science at the end is particularly interesting - including the observation that the strength of science lies in vigorous challenge to hypotheses.
Moderator Response:[TD] People who are interested in global temperature look at the temperature of the globe. The whole globe. Land and water. Because that is the definition of "global."
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nigelj at 12:06 PM on 2 August 2017Underground magma triggered Earth’s worst mass extinction with greenhouse gases
Changes and problems in global fisheries already happening, due to warming oceans, from research in Nature
science.time.com/2013/05/16/why-warming-oceans-could-mean-dwindling-fish/
Predictions on effects of global warming on fish species, and possible adaptation problems.
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chriskoz at 11:33 AM on 2 August 2017Underground magma triggered Earth’s worst mass extinction with greenhouse gases
Thanks Howard. While rading it a question of PETM was dorming in my head, until it got answered in the last paragraph.
The evidence points that there is a tipping point in a rate of GHG degassing rate triggered by LIP. Life cannot adapt to the changes too fast, past said tipping point. If we can deduce from said evidence that PETM was not fast enough (i.e. did not reach a tipping point to affect most land forms), then the conclusion is: marine lifeforms will be first to go as the result of AGW. We may be mildly confident that AGW rate is at least as fast as PETM, though it may not have reached the scale of PETM which is another important tipping point not discussed here, but in case the required scale is reached lots of marine species may already be doomed. But to determine the vulnerability land species, a comparison it to end-Permian is required but such comparison is difficult I guess.
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