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Tom Dayton at 02:03 AM on 17 May 2015New study finds a hot spot in the atmosphere
Interesting point in the comments at HotWhopper, that the term "tropospheric hot spot" seems not to be used scientifically. Implications of failure to use that term are more than merely semantic.
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Tom Dayton at 02:01 AM on 17 May 2015New study finds a hot spot in the atmosphere
Mike Mann has an excellent description of this new study's relevance to AGW. In brief,
What's the punchline? Well, if global warming really *were* due to a (natural) decrease in volcanic activity over time (rather than due to an anthropogenic increase in greenhouse gases), then we would expect to see an increase in global surface temperatures WITHOUT any mid-tropospheric "hot spot".
In the end, then, the confirmation of a "hot spot" in this latest study by Sherwood and Nishant isn't completely irrelevant to the issue of human-caused climate change. While it may not be a unique fingerprint of anthropogenic greenhouse gas increases, it does nonetheless potentially allow us to rule out at least one possible suspect (changes in volcanic activity). It turns out that anthropogenic changes in ozone (both tropospheric, as a surface pollutant, and stratospheric, as a result of stratospheric ozone depletion) are another potential "forcing" of climate change that does not have a clear "hot spot" signature as part of its fingerprint.
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michael sweet at 01:49 AM on 17 May 20152015 SkS Weekly Digest #19
Slcochran,
Perhaps you want to read about the Denial 101 course currently being run by John Cook, the originator of Skeptical Science. Come back and comment again after you read at least the course description.
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slcochran at 00:01 AM on 17 May 20152015 SkS Weekly Digest #19
You're going at this all wrong. The people who use critical thinking already acknowledge anthropogenic global warming, but you're not influencing those who are bound up by their belief systems. I'm surprised that everybody on SkS seems to be denying science! (jsut to tweak your nose).
Neuroscience tells us clearly that throwing facts at a belief system only enforces that belief system. They don't accept your facts and arguments because they don't want to accept them as it challenges their preconceived notions, and change to that belief system is threatening to them.
SkS would be even more useful if you began to tackle framing. Some references: The Righteous Mind- Jonathan Haidt, Moral Politics, How Liberals and Conservatives Think- George Lakoff, The Republican Brain- The Science of Why They Deny Science- and Reality- Chris Mooney, The Political Brain- Drew Weston. Yes, these are all politically oriented, but the science is the same. And, yes, they do point our the preponderance of irrational belief systems among Republicans, but I believe that the vast majority of climate change deniers belong to that particular party (I don't have a reference for that statement, but I don't have a reference that supports my claim that the sun comes up in the East either).
Moderator Response:[JH] Please enter the word "framing" into the SkS search box and read all of the articles that are identified. It's always best to "look before you leap."
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MA Rodger at 19:37 PM on 16 May 2015Models are unreliable
Moderator Response @911.
The exercise being embarked on is described by Klapper @908 thus - "I have been reviewing Hansen et al. 'Earth's energy imbalance & Implications' (2011) and think it would be a useful exercise to update this paper with the very latest data."I am assuming this exercise addresses specifically Section 9 of that paper although I fear the selective intent indicated @911 suggests some part of the method employed in Hansen et al (2011) Section 9 is being airbrushed away. There is also some issues with the use of TLT, the use of global land ΔSAT for the Land Heat Uptake, etc. However, while this analysis is not being addressed with the rigour it requires, all the palaver is a tiny a bit pointless. The update will, after all simply show that net energy imbalance is still overwhelming recorded in ΔOHC(0-2000) which weighs in at roughly 1.0W/m2 (2010-2014) compared with 0.65W/m2 (1993-2010) & 0.42W/m2 (2005-2010) in Hansen et al (2011).
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PluviAL at 12:05 PM on 16 May 2015Monthly global carbon dioxide tops 400ppm for first time
Tom Curtis @11, 100% in agreement with C-Tax to engage inventiveness of market.
@10, Thanks for excellent response, right as usual. My oops; top-of-hat calculation took the whole earth's surface instead of only land area. Forestation takes time, but plentiful water can reduce it by orders of magnitude. Living in the desert too, I have converted rocky lots into gardens in 2 years. Also, you are right 8kg/m2 is very conservative for sequestration.
Our reason for difference in appreciation of this line of attack is that I assume water can be pulled from the atmosphere at a negative cost. Process will produce electrical power as it is pulled out with nature's process. J. P. Espy's convection concepts is a starting ides. He was a founder of the science of meteorology. We know a lot more today than in the 1800. Burning forests is unnecessary, solar and latent heat energy are more than sufficient, and flow architecture can surpass natural precipitation production rates (conventional theory on this). As one byproduct, at 0.05% electrical production from free energy flux, a plant can produce more than a nuclear power plant, at <1/20th the cost, and mostly positive externalities. I'm working on a patent for that.
If it works, we can transport water in unlined canals specifically to percolate excess water from the oceans onto the earth, while absorbing CO2, and increasing forestation. I think the net radiation from earth increases with forestation, especially, if water for such growth is squeezed out of the subtropics as envisioned. The process concentrates heat in the upper atmosphere to radiate at k-temp difference to the 4th power.
Finally, I totally concur that desert habitat must be protected, but be we can afford to lose a lot more, hopefully redundant, desert than tropical forest at this time. Before proceeding with any of my ideas I expect many PHd's on each topic you point out to consider externalities.
A carbon tax, along with civic infrastructure improvement (laws which allow us to exclude, and move out troublesome people from communities, or with true rehabilitation which includes philosophical reprograming, nutritional re-regimentation, etc... etc... can allow for much more enjoyable walking cities and integrated communities. Such harmonious high density communities will be the biggest factor in reducing energy consumption as we confront the topic in full force at the end of the century. Markets can also be involved in this. Markets can also make this wild sounding idea practical and take the nasty sides out of it. ( I have a BA in sociology... but don't tell anyone from my U I am thinking these heretical thoughts.)
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Mal Adapted at 09:37 AM on 16 May 2015Lukewarmers – the third stage of climate denial, gambling on snake eyes
The loudest deniers, I am speculating, are doing it, even though they don't believe it, because inwardly they have been convinced that we don't need to do much, if anything. However, as political animals, they know that selling the public that is a weak flawed message. FUD works better to achieve their ends.
I don't think it strains credulity to suggest that Inhofe, Morano, Monckton inter alia understand perfectly well that the costs of AGW will be paid by someone, sometime, but they just don't care. They'll say whatever they think will maximize the profits of their patrons in the short term.
Knowingly making counter-factual assertions for personal aggrandizement is the second-oldest profession, after all.
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Klapper at 06:45 AM on 16 May 2015Models are unreliable
@MA Rodger #910:
No, I hadn't forgotten it. I just don't have a database to calculate it from (that I know of). Neither do I know of a database which estimates minus 2000 m heat content. I think I will do my own calculations of the land heat flux, and present all what I have calculated so far (0-2000, sea ice melt, continental ice melt, troposphere heat gain/loss and present that total W/m^2 forcing. The truth is that some components, like montane ice melt are less than the thickness of the line on the graph at these scales (as becomes readily apparent when looking at either my graphs or Hansen et al 2011 Figure 12.
Moderator Response:[JH] What exactly are you trying to accomplish with your calculations? What do they have to do with OP? Perhaps you should consider creating your own website to fully display what you are doing rather than expecting SkS readers to give you feedback on your "works-in-progress" on our comment threads.
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MA Rodger at 05:09 AM on 16 May 2015Models are unreliable
Klapper @909.
Do remember there is significant land ice melting that isn't sat on either Greenland or Antarctica. See AR5 Figure 4.25 which suggests such sources added some 4,500Gt to ice loss in 18 years = 250Gt/y. That would add about 0.005 W/sq m to your totals.
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Tom Curtis at 04:55 AM on 16 May 2015Monthly global carbon dioxide tops 400ppm for first time
An addendum to my @8, I should note that I am excited about new developments in battery technology. It is not that I think they are the way to a renewable future. It may turn out that Audi's e-diesel is the more economic option for transport, and systems similar to Isentropics pumped heat storage (both of which also excite me) are the better solution for standing power systems. What I want to see is multiple such developments competing in a world with a price on carbon. With such competition, the most economic overall system with the best side benefits will develop.
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Tom Curtis at 04:44 AM on 16 May 2015Monthly global carbon dioxide tops 400ppm for first time
PluviAL @8, according to wikipedia, the total land are of the Earh is 148.94 million km^2. The deserts of the Earth represent about a third of that, or 43.97 million km^2 if we sum the areas of the world's 10 largest deserts. That, however, includes 14.2 million km^2 from the Antarctic Desert, and 13.9 million km^2 from the Arctic desert. If nothing else, I think in any plan to tackle global warming we would want to keep both the Antarctic and Arctic deserts frozen (and have no choice in the short term for the Antarctic desert). That leaves approximately 20 million km^2 as the total available desert area for reforestation.
With a difference of C storage of 8 Kg per m^2, reforesting the 20 million km^2 would sequester at least 160 GtC, or the equivalent of 34 ppmv of atmospheric CO2 considering only the retained fraction in the atmosphere. That would indeed be a substantial contribution to combating global warming, but represents only 40% of the difference between current total cumulative emissions and the trillion tonnes of Carbon which is the upper limit to give us about a 2 in 3 chance of avoiding more than 2 C warming. Your C sequestration estimates are conservative, so it would not surprise me if you could double that, but not through reforesting more desert as there will not be more desert to reforest.
Having said that, reforesting deserts is a slow and complex process. You cannot plant trees in the Sahara and expect them to grow. You first need to build up a reasonable soil quality by planting arid friendly grasses. This would be a project over decades, and possibly centuries. We do not, however, have decades so the program, if pursued, would be a small supplement for mitigation by conversion to renewable technology, not a substitute for it.
Further, the energetics and engineering challenge of providing pipelines to water 20 million km^2 would be massive, not to mention the ongoing energy demands of desalinating and pumping the water. In addition, desert has a much higher clear sky albedo than does forest. Therefore your project could substantially increase the amount of solar energy absorbed. This is not entirely clear in that forests have much greater cloudiness than do deserts, but that in turn points to a substantial greenhouse effect from those clouds, and from the increased humidity in the formerly desert regions in general. It is beyond me to estimate the total forcing from such a project, but it may well be larger than that from the carbon sequestered. Finally, having grown up in a semi-desert, I have a fondness to arid landscapes. It is certainly not clear to me that we should condemn all the worlds desert species to exinction in our efforts to tackle global warming, as your plan would require.
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Xulonn at 04:00 AM on 16 May 20152015 SkS Weekly News Roundup #20A
After reading the David Roberts Vox interview with libertarian guru Jerry Taylor, I'm glad to find out that some libertarian thinkers are staarting to lea towards supporting a carbon tax. However, when Taylor says " the credible climate scientists — Dick Lindzen, [Pat] Michaels, Judith Curry, Bob Balling," I realized that he has a long ways to go to recognize scientific reality.
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One Planet Only Forever at 02:34 AM on 16 May 2015Lukewarmers – the third stage of climate denial, gambling on snake eyes
mancan18@6,
It is indeed clear that the public claims made by a few people with science credentials are contrary to the actual science they are aware of, or have little excuse not to be aware of. The same goes for a few people in positions of leadership or a few people who have become very wealthy.
The popular support for those types of claims, and the poeple who make them, is what needs to be overcome. And the science and history of marketing indicates that misleading marketing can be very effective at delaying the growth of awareness and the acceptance of the actual facts of the matter. It also indicates that eventually the power of the misleading marketing will fail, but potentially only after a long run of success, even damaging success. And even when the clear majority finally accept the developed better understanding of what is going on, many people will continue to believe the unbelievable.
This matter is one that cannot wait for the inevitable growth of awareness and better understanding of what is going on. It is like the genocide in Rwanda or the need to end Aparthied in South Africa. It requires coordinated global leadership action based on the understanding of what is going on contrary to the interests of some powerful wealthy people.
One of the strongest motivators for the popularity and persistence of unbelievable beliefs is the opportunity to obtain personal gratification or benefit. The success of Lottery marketing proves the power of the hope of getting-lucky even in cases where the facts clearly are that the vast majority of the hopeful will be losers.
In the case of the consequences of the production of excess CO2 the facts of the matter are that the ones getting away with benefiting actually have little reason to personally be concerned about the consequences of their actions. People who will not benefit from the continuation of the unacceptable activity, particularly future generations, have little ability to influence what is going on. And the future generations have absolutely no influence. They have no vote today, no investment influence today, no purchasing power influence today, no lobbying influence today. So the popularity and profitability of activity that cannot be continued to be enjoyed by generations far into the future and which creates potential significant problems for those in the future is very difficult to overcome. Simple statements of the facts of the science will not influence someone who has no personal reason to care and chooses not to care.
So 'people with science credentials and people in positions of leadership and influence who willingly try to make claims and maintain the popularity of belief that do not stand up to rigorous scrutiny given all of the information such people have no excuse to not be aware of' are like the cheaters in a sporting event or people who drive after drinking. They are aware of the unacceptability of what they are doing, but they think they can get away with it and they want to try to get away with it. There is no kind term of reference for that kind of person, contrary to what that kind of person would try to claim.
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Klapper at 02:27 AM on 16 May 2015Models are unreliable
@Klapper 908:
In addition to the atmospheric component of global heat changes, I've worked up a graph showing the ice melt component. Arctic sea ice is from PIOMAS data, Greenland and Antarctica are from GRACE data and before that some "generic" estimates of ice mass loss for these 2 continental sheets. Antarctic ice melt is my own model based on average thickness and the delta in ice area. Crude but as you can see, either way ice melt is not a big component of the global heat flux equation.
Compare this with Hansen et al 2011 Figure 12. Ice melt is a very small contribution to the global TOA energy imbalance and recent increases in ice sheet melt are to a degree cancelled out by recent increases in global sea ice. Note I am using the same method as Hansen, a rolling 6 year trend to calculate ice mass changes, and thereby heat fluxs on a global TOA basis.
Moderator Response:[RH] Reduced image site to fit page formatting.
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uncletimrob at 17:48 PM on 15 May 2015Lukewarmers – the third stage of climate denial, gambling on snake eyes
@8Neo Yes, good description.
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bozzza at 15:18 PM on 15 May 20152015 SkS Weekly News Roundup #20A
Referring to the article on the Larsen-C ice-shelf it says:
An ice shelf forms when a glacier on land reaches the coast and flows into the ocean. If the ocean is cold enough, the ice doesn't melt. Instead, it forms a permanently floating sheet of ice.
What temperatures are we saying makes it too cold for an ice-shelf to melt? By contrast what temperatures are we saying makes it start to melt and how difficult a question is this to actually answer?
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wili at 14:34 PM on 15 May 2015The Debunking Handbook in Icelandic
hrakinga...I love Icelandic! It also puts me in mind of variation on the motto from Game of Thrones that robertscribbler just coined:
Winter is Dying!
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bozzza at 14:12 PM on 15 May 2015Monthly global carbon dioxide tops 400ppm for first time
As far as batteries? That’s a weak solution, the assumption is that renewable energy can then power our car cityscapes: 1) Pollution in creating the infrastructure, 2) expansion of demand to meet supply from car cityscape concept. 3) growing world wealth
I think it is more than worth reminding ourselves what 'economics' means so, yes, considering exactly these types of points of view. There is an idea called Jevons Pardox which I think is what you talking about and more specifically how there must be a point of diminishing returns,... and a tipping point at that if I may!
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Rob Honeycutt at 11:17 AM on 15 May 2015What if Climate Change is Real? Katharine Hayhoe TEDx at Texas Tech
anticorncob6... Because you're looking at a reconstruction of the holocene (the past 10,000 years) and the MWP was only about 800-1200 years ago.
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Neo at 11:10 AM on 15 May 2015Lukewarmers – the third stage of climate denial, gambling on snake eyes
Spot on uncletimrob, it is very similar to how Bloom's Taxonomy works. Perhaps I should have emphasised an 'inclusive hierarchy'. Essentially, it just provides deniers with more avenues of excuses and in a way they use it to try and cloak themselves in some scientific respectability (when it suits them).
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anticorncob6 at 10:38 AM on 15 May 2015What if Climate Change is Real? Katharine Hayhoe TEDx at Texas Tech
Why doesn't her graph around 10:30 in the video show the medieval warming period as clearly as other graphs I have seen?
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scaddenp at 10:38 AM on 15 May 2015Lukewarmers – the third stage of climate denial, gambling on snake eyes
What Lindzen says scientifically, (ie in peer-reviewed journals) is not a problem and is addressed there. Addressing what Lindzen says when talking to the naive (eg congress) is the problem. I wonder how many of the statement list here would have been made if addressing an audience of his peers?
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mancan18 at 09:51 AM on 15 May 2015Lukewarmers – the third stage of climate denial, gambling on snake eyes
Attaching derogatory labels to opponents of your argument does not promote better understanding in non scientist. It allows your opponents to to stereotype you and then dismiss the worth of anything you say. This in turn polarises the argument to its extremes and eventually leads to a megaphone debate. In a scientific debate, it is the sober, well argued, revealation of scientific information, without resorting to stereotyping of opponents that will ultimately win through, i.e. the information will always trump the stereotype. Also, to convince genuinely skeptical people, rather than the so called climate denier/skeptic/obstructionists, you need good metaphors easily understood by non-scientists, to convince people. In other words SMILE, simple makes it lots easier, is better.
While Sks presents the scientific arguments, sometimes, the complexity of the scientific debate does not make the science easily accessible to the non-scientist. This leaves a chasm for opponents to AGW and CC to use dismissive stereotypes to drive through their scientific misinformation and political rhetoric. The CO2 problem for the Earth is similar to a swimming pool whose chlorine pump is broken. Even though the quantities are small, if too much chlorine accumulates, you will get burnt; if there is too little, you will get algae. In both cases you won't be able to swim in the pool. Other metaphors, like intravenous administration of a drug, again, only trace quantities are used, but too much you will die, too little you will get sicker and may die. The same goes for a fertilizer/farming metaphor. To much you can't grow anything, too little you get weeds. The minute increase trace argument, can be likened to interest rates on an investment account, and the climate models are unreliable argument, might be better counteracted by wondering why they rely on economic models to make their investements which is surely as complex, and not always accurate. There are plenty of simple metaphors to describe the CO2 problem before explaining the scientific complexity of the carbon cycle where the recent rise in CO2 is put into its proper geological context.
To question a scientist as eminent as say Richard Lindzen, there is no need to resort to a label. You can use what he presents scientifically. As I understand it, he predicts that doubling CO2 will only yield a 0.5 degree C increase in temperature, hence of no consequence. However, over the last century we have already seen a 0.8 degree C increase in temperature, while CO2 levels have increased by 40%, hardly a doubling. Without any other scientifically verifiable casuality, I would have thought that this would be enough to negate his key argument, that doubling CO2 is not significant. There is no need to use labels like denier. Leave the labels like warmist, carbonite, leftie, greenie etc. to those whose scientific arguments are so weak that they have to resort to them. Also, I would have thought that the 15 degree difference in the average global temperatures between the Earth, with its 200-300 ppm CO2 (today 400 ppm), and the Moon (zero CO2), and with the paleoclimate evidence, would be enough to address the climate sensitivity issue in the mind of non scientists. Presenting simple scientific inconsistencies in the argument of opponents by using simple metaphors is more likely to promote better understanding than resorting to yet another label.
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PluviAL at 06:31 AM on 15 May 2015Monthly global carbon dioxide tops 400ppm for first time
@ 1 TomR, Both the Tory win and the battery hope are bad news. The good news is that if we look outside the box that we choose to think in, a solution is still possible for another 100 years or so. Political victory will go increasingly to the anti-climate control side, forever. One could extrapolate species self-extinction from this. People want more cars and junk, and they will do anything to get it. Self-delusion is no problem as we all know. As far as batteries? That’s a weak solution, the assumption is that renewable energy can then power our car cityscapes: 1) Pollution in creating the infrastructure, 2) expansion of demand to meet supply from car cityscape concept. 3) growing world wealth.
The good news is that at 20% of land, deserts represent about 100 million km2. Since they currently only hold less than 2 kg biological Carbon ( C ) per square meter. If these were forested C content could increase to 10 or even much higher, depending on water regimen. A little arithmetic tells us we could accommodate 160 GT into 20% of deserts. If we make them really rich forest, or sequester the biomass into the soil systematically, we can double that to 320 GT, then double the amount of desert we can take out 640 GT. That's greater than the current C budget for 2 degrees right?
The problem is our imagination is nailed down to old ideas, and new ideas must fit inside those old ideas. However, a good carbon-tax could free up our imagination through market mechanisms.
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SkepticalRaptor at 06:21 AM on 15 May 2015Ask Me Anything about Climate Science Denial
"Scientific consensus" has a distinct meaning in science. It is not a debate, it is solely dependent upon the quantity and quality of evidence published in high level peer-reviewed journals. As I've written before, it is not a debate, it is not an argument. It is only one thing, it is collective agreement by the scientific experts on a particular scientific issue. It is absolutely based on evidence, and evidence alone.
Like "scientific theory", "scientific consensus" has been polluted by the the more common, and less scientific, definitions of these words. In science, a theory is essentially a fact, and a fact that can be predictive. The scientific consensus is not based on a debate amongst 10 scientists in a room. It is not some form of democratic voting. It is just a weighing of the quality and quantity of evidence.
Scientific consensus is what eventually forms a scientific theory, which is predictive in power. Anthropogenic climate change has already achieved a consensus.
The scientific consensus is solid about anthropogenic climate change. If someone wants to refute that, they need to bring real scientific data in the volume and quality that supports the consensus, not logical fallacies or conspiracy theories. -
Ronsch at 05:39 AM on 15 May 2015Ice loss in west Antarctica is speeding up
I'd like to point out that 100 years ago Einstein showed that gravity doesn't attract but rather distorts space which causes objects to move towards each other. Therefore you cannot say "The huge ice sheet has such a large mass that it attracts objects toward it", but rather that it distorts space around it and thus moving the satellite towards it.
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michael sweet at 05:25 AM on 15 May 2015Lukewarmers – the third stage of climate denial, gambling on snake eyes
It strikes me that people who used to call themselves "skeptics" now often call themselves "lukewarmers". Anthony Watts and many others come to mind. Lundzen in 1989 said that warming would not exceed the noise in the data. Hansen was correct in predicting warming. The "skeptic" brand has been shown to be incorrect. They are trying to continue their stalling by putting on a new hat. How long will it take the mainstream media to see through the new outfit?
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jenna at 23:43 PM on 14 May 2015Lukewarmers – the third stage of climate denial, gambling on snake eyes
The "Making Science Public" blog (The University of Nottingham) has a very interesting article on the 'Lukewarmer' label, well worth the read.
http://blogs.nottingham.ac.uk/makingsciencepublic/2015/05/14/lukewarmers/
Moderator Response:[JH] Thanks for bringing this most informative post to our attention. It's authored by Brigitte Nerlich, Professor of Science, Language and Society – Institute for Science and Society, The University of Nottingham. Director of the Leverhulme research programme ‘Making Science Public‘ and PI on ESRC funded project devoted to charting climate change debates.
Nerlich’s blog post has generated a lively comment thread discussion by a number of “luminaries” from Deniersville.
PS - Link activated.
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Nick Palmer at 23:33 PM on 14 May 2015Lukewarmers – the third stage of climate denial, gambling on snake eyes
I have long suspected that the most voluble deniers, such as Morano, Inhofe, Monckton etc continue to use arguments that they surely know have been debunked for one reason. That is that those sound bite factoids and arguments work very well to sway the minds of the general public, in op-eds, lectures, articles or debates.
Why wouild they want to do that? I think that behind all the out and out antiscience they spout, these people have been secretly convinced by the lukewarmers, such as Lindzen and Spencer, that the ultimate results of us continuing to use fossil fuels won't be very much at all - benefits may balance harm and we'll have enough time to adapt to any harm.
The loudest deniers, I am speculating, are doing it, even though they don't believe it, because inwardly they have been convinced that we don't need to do much, if anything. However, as political animals, they know that selling the public that is a weak flawed message. FUD works better to achieve their ends.
If they told the public that a few scientists claim that the sensitivity is lowe enough that w wouldn't need to bother, they know that the public would then look at Dana's analogy of throwing dice and weigh up the risks of believing the lukewarmers or everybody else. I think most ordinary people are sensible enough to judge what to do. They look both ways when crossing the road, they don't buy outdated food. They wouldn't risk their climate on a minority scientific view.
I have come round to the belief that the danger of trusting in the lukewarmer position is the greatest problem we have. I think science and science communicators need to get that message out far bettre than has been the case previously -
bozzza at 17:08 PM on 14 May 2015It's not urgent
@7, another indicator worthy of attention in my mind is that Bjorn Lomborgs political message was that 3C was a more sensible target... what this indicates I don't like!
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bozzza at 17:03 PM on 14 May 2015It's not urgent
@6, There was a famous interview/commerical-I-suppose on Youtube a number of years ago(not sure how many) where Dr David Mills was saying there is now no way we can stay under 440ppm....so the information being floated around does seem a little contradictory and the denial brigade can almost be forgiven for driving mack trucks through what seem like gaping holes of information. Yes, it all depends where you go for information of course.
My point was that I'm guessing a lot more than 440ppm is locked in- I'm not sure how This David Mills character came up with his numbers so I am of course merely guessing/being potentially paranoid... the IPCC reports are known to be conservative by nature for instance and there was an article just recently on Sterling Engines being tested in South Africa over the last 4 years... combining this with the new phenomenons of formula-e racing and possibly Virgin competing with Tesla for the electric car market and Tesla itself saying it may just go into producing batteries the world does seem to be displaying something of a turn !
(I could find that video but it may take some searching... the only relevant information was that he though 440ppm was locked in and they didn't know if it was possible to go over the limit and then come back down under at that time but that it would be impossible to not break it in the initial sense!)
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uncletimrob at 16:58 PM on 14 May 2015Lukewarmers – the third stage of climate denial, gambling on snake eyes
@Neo. I believe that it is hierarchical in the same way that a person can be "situated" in one step of Bloom's Taxonomy for say Maths but in another lower or higher step for another subject, say English. My experience as a teacher suggests that even within one subject a student can move from one step to another depending on the topic.
So, I'd suugest that the people you describe are moving between steps of the denier hierarchy, perhaps depending on their level of understanding of each area of discussion/dispute.
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Neo at 14:27 PM on 14 May 2015Lukewarmers – the third stage of climate denial, gambling on snake eyes
A very informative scale for climate change denial. However, would you describe it as a hierarchical because I notice deniers I converse with will tend to regress or default to lower levels depending upon the topic or even via their desperation. For example, they might admit to warming in relation to evidence of temperature rises but another time will say the planet has parts that are not warming or that these balance out the warming. It would be interesting to do a longitudinal study of deniers over time to see how their denial progresses and with what frequency they might regress.
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Rob Honeycutt at 13:58 PM on 14 May 2015It's not urgent
Oh, and regarding "point of no return..." "Point of no return" would likely not be a term anyone would use since it leaves too many loose ends.
We are currently at about 0.8C over preindustrial global temperature, and with thermal inertia we've banked about 1.2C of temperature rise no matter what we do.
That, in and of itself, means there are going to be aspects of climate change that we can't stop and will have to adapt to. After we pass 2C over preindustrial temps we risk passing tipping points where we don't know how much additional warming will result. Researchers are urging us not to pass that 2C limit. At around 0.2C/decade... meh, we have a little bit of time, but we desperately need to be enacting policies now that can keep us below that 2C limit.
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Rob Honeycutt at 13:51 PM on 14 May 2015It's not urgent
anticorncob6... The writer said concentrations "could" peak around 400ppm, but clearly we're screaming past that level right now. That was written four years ago, and I'd have to say was a very optimistic outlook.
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Tom Dayton at 12:34 PM on 14 May 2015Ask Me Anything about Climate Science Denial
An intriguing case study in denialism is climate scientist Cynthia Nevison complaining about global warming deniers, but vigorously promoting anti-vaccine crankerism and even being a leader in that "field." Respectful Insolence has details. I truly am intrigued by her case, from a psychological standpoint; John Cook, do you have any thoughts on how she maintains those two contradictory positions?
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Rolf Jander at 11:55 AM on 14 May 2015Tom Harris' Carleton University Climate Misinformation Class
Vancouver Province is definetly biased against climate science. I was mildly suprised to see my letter made it in at all.
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Tom Dayton at 11:21 AM on 14 May 2015Ask Me Anything about Climate Science Denial
An interesting list of denialist tactics is on SkepticalRaptor.com.
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anticorncob6 at 10:00 AM on 14 May 2015It's not urgent
You said here that carbon concentrations will peak at 400 ppm in 2025 under the ideal situation, but it's only 2015 and we're already at 400 ppm, and I see no signs of global emission reductions happening soon. Is this evidence that we will pass the point of no return?
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scaddenp at 07:26 AM on 14 May 2015What do volcanic eruptions mean for the climate?
That's a very useful little diagram Howard.
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Jim Hunt at 07:21 AM on 14 May 2015Antarctica is gaining ice
UW/bozzza - Perhaps this is a canonical example?
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Jim Hunt at 06:39 AM on 14 May 2015Antarctica is gaining ice
UW - Perhaps I'm being naive. but it seems bozzza understands all that. I ultimately understood his question to be "how might one wrap all that up neatly in a catchy headline", or at most a sentence or two.
"Real-politik" rather than "Rignot et al."?
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UltimateWarrior at 04:42 AM on 14 May 2015Antarctica is gaining ice
bozzza, Re the data you reference regarding 2D ice extent increases in Antarctica, the 3D ice mass budget studies indicate large accelarations in the rate of 3D ice loss (mass not 2D measurment).
See the article SOTC: Ice Sheets, which refernces these studies (Rignot et al. 2008).
The 2D ice extent in the Arctic (north pole) indicates a downward trend.
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Tom Dayton at 02:10 AM on 14 May 20152015 SkS Weekly Digest #19
Black humor for today at the New Yorker:
Scientists: Earth Endangered by New Strain of Fact-Resistant Humans.
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howardlee at 01:54 AM on 14 May 2015What do volcanic eruptions mean for the climate?
Just to note that this article relates to 'normal' volcanic eruptions. Regular visitors to this site will recall there have been several articles on Large Igneous Provinces that have occurred rarely in Earth's past, were colossal, and which generated dire environmental consequences including global warming. Some article links: here and here and here.
LIPs are an altogether different phenomenon than normal volcanic eruptions.
There have also been Supervolcano eruptions much larger than 'normal' volcanic eruptions (but much smaller than LIPs) as summarised by the USGS here.
I put together this handy dandy graphic so people can get an idea of the relative scale of these things. The area of each circle represents the volume of lava erupted.
Moderator Response:[RH] Resized image. Remember to keep images down to 500px.
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greg_laden at 01:37 AM on 14 May 2015What do volcanic eruptions mean for the climate?
Nitpick: Maybe change the first sentence of the post to indicate that Calbuco erupted on April 22, 2015, rathe than last night.
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DSL at 01:17 AM on 14 May 20152015 SkS Weekly Digest #19
Follow-up to HK on GISS L-OTI for April:
— 2nd warmest April (2010 - .85)
— 14th warmest month (tied)
— 2nd warmest 12-month period
— The last five 12-month periods have been top five warmest
— 2nd warmest 6-month period (last four are top four)
— Warmest 36-month period (last four are top four)
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HK at 23:26 PM on 13 May 20152015 SkS Weekly Digest #19
GISS has released their April data: +0.75°C.
The average so far this year has been +0.79°C (record!), and the last 12 months +0.73°C (also record!).
Most forecasts predict a strengthening of the ongoing El Niño, so 2015 will almost certainly become the first year warmer than +0.7°C, and maybe even warmer than +0.8°C. The following months will be very interesting!
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MA Rodger at 22:47 PM on 13 May 2015Climate's changed before
skeptic1223's over-enthusiasm for linking present-day CO2 levels to some threashold CO2 level which allowed the era of ice-ages to kick off appears to have run its course. Yet he did present one aspect of climate that seldom gets discussed.
skeptic1223 began his input way up @420 with the observation that orbital forcing had become a bigger feature of climate since the inception of the Arctic glaciation by creating higher ampitude oscillations in the global temperature record. The graphic below (derived from Lisiecki & Raymo (2005) Fig 4) was presented @423 by way of illustration.
Such apparent increases in ampitude do support the idea of an increase in climate sensitivity in some manner as in the long run orbital forcing cycles are constant in size. Such forcing is large at specific latitudes while small globally. To suggest this increased ampitude (and thus increased sensitivity) is somehow a function of CO2 levels is of course wrong. But it does beg the question - why doesn't this increased ampitude in oscillation make ECS vary with temperature/Arctic glaciation?
My view of this is that to calculate the sensitivity of climate to orbital forcing from what appears a hysteresis loop could be used to show big sensitivity changes but these would not be very helpful for our purpose of finding ECS under AGW. Thus the slow feedbacks of albedo, CO2, methane, etc. are considered as forcings rather than feedbacks to allow a meaningful ECS to be calculated.
The reference cited by AR5 in this matter is PALAEOSENS Project Members (2012) which states:-"Astronomical (orbital) forcing is a key driver of climate change. In global annual mean calculations of radiative change, astronomical forcing is very small and often ignored. Although this obscures its importance, mainly concerning seasonal changes in the spatial distribution of insolation over the planet, we propose that the contribution of the astronomical forcing to (the climate forcing) may be neglected initially. When other components of the system respond to the seasonal aspects of forcing, such as Quaternary ice-sheet variations, these may be accounted for as forcings themselves."
This accounting of slow feedbacks as forcings is a reason for ECS only accounting for fast feedbacks.
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HK at 17:44 PM on 13 May 2015Monthly global carbon dioxide tops 400ppm for first time
Phil Plait has a very clear message about this topic here.
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