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Comments 1 to 50 out of 89:

1. caerbannog at 15:53 PM on 20 April, 2012
   If this is a bit off-topic, at least it is *inspired* by this thread's topic... How do "skeptics" know that they are right? Well, to put it bluntly, sometimes it is just plain old Dunning-Kruger incompetence (or ideological blindness masquerading as incompetence). Check out the latest beverage-through-the-nose piece at WUWT. And don't say that I didn't warn you!!!
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   Moderator Response: [Dikran Marsupial] Oh well, once more unto the breach, dear friends, once more...
2. NewYorkJ at 17:43 PM on 20 April, 2012
   Ari has some insight... "Curiously, in many cases the same people who present their own claims with absolute certainty, go around saying that climate scientists cannot know anything because things are so uncertain. If uncertainty is their product, how come they are making their claims with certainty?" The highly-certain claims I think are a bit of Dunning-Kruger incompetence, as caerbannog puts it, but it's also used for rhetorical effect. Confident claims repeated many times resonate more among the general public than claims filled with the proper caveats or questions. The former is how politicians usually operate, but at least with politicians, there's some genuine scrutiny of and accountability for their words and actions. A true skeptic might ask "do climate models project periods of a decade with little warming and if so, what factors might lead to that?", then seek an honest answer. A denier would falsely but confidently assert "climate models predict it will get warmer year over year" but that hasn't happened" then cherry-pick some endpoints on a graph and assert CO2 doesn't cause much warming. Good skeptics are very inquisitive. From my observations, those calling themselves "skeptics" of climate science tend to not be very inquisitive, especially those who lack expertise (D-K Effect again). The uncertainty card is also played for rhetorical effect. The idea is to cast scientists as being arrogant and overly-confident in their beliefs, not humble and open-minded like skeptics. Another goal is to imply uncertainty means we know next to nothing. But if true, why are the same "skeptics" so confident? There's nothing to worry about, after all, except of course for the costs of mitigation, which will be catastrophic. And so the blatant contradiction. The two are sometimes combined in some sense. There are those who assert that uncertainty is higher than studies indicate, and those assertions themselves are stated with great certainty. The temperature record is unreliable, the IPCC doesn't appropriately capture uncertainty in climate sensitivity, models have no skill...the "we just don't know" statement carries with it the implicit certain claim that all of the evidence that would indicate otherwise is largely bogus.
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3. MA Rodger at 17:47 PM on 20 April, 2012
   caerbannog @1 Your link certainly threw me straight into a "how do I know I'm right" moment. You point to an hour-long video posted at WUWT. Do I waste an hour of my life listening to the nonsense spouted by some Aussie Professor dude? The written introduction is as clear as mud. I could examine what the comments say about it, but at WUWT? No thank you! So why do I dismiss the vodeo as nonsense? If this Professor is 'right' that CO2 increases are natural, if his theories are more that total nonsense, I will surely meet them again presented in a better way in a better place. Yet I consider this an unlikely outcome. "Birds of a feather..." The people who accompany village idiots tend also to be of that ilk.
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4. Doug Hutcheson at 18:10 PM on 20 April, 2012
   caerbannog @1, I followed your link and my head exploded. The comments are delightful, though, so I copied a couple for the entertainment of SkSers:

   Smokey says: April 19, 2012 at 4:22 pm The central point should be that, obviously, the rise in CO2 is entirely beneficial. The biosphere is starved of CO2. More is better. I know that will make some folks’ heads explode, but that’s what happens when their cognitive dissonance meets reality. trevor says: April 19, 2012 at 4:25 pm I think this is one of the best posts of WUW I’ve seen. Good scientists present the data and let the audience make their own conclusions – exactly as Salby does in this lecture.

   Good scientists present the data and let the audience make their own conclusions? When did that start happening? I thought good scientists publish their conclusions based on their data. Funny how wrong I was ... Good to know the estimable Salby is attracting friends at WUWT, as that is a good inverse-ratio indicator of the veracity of his claims.
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5. shoyemore at 19:00 PM on 20 April, 2012
   caerbannog #1, Salby gave a public talk last year that was greeted with almost complete derision by scientists in the field. Since then he dropped out of sight. I do not think his musings have made it past peer review. It is not clear if he has even tried. There is a thread about his views here: Murry Salby confused about the carbon cycle The Irish comic writer Flann O'Brien has a scientist called de Selby in some of his books. Among de Selby's theories is one that night is caused by a gathering of atmospheric dust. I see a definite relationship.
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6. Eric (skeptic) at 19:45 PM on 20 April, 2012
   By far the biggest problem with sites like WUWT, which sometimes leaks over here, is that uneducated people look at a "debate" about basic physics and assume that this is somehow a mainstream scientific controversy. I would suggest rather than argue against bad physics why not show why the deep ocean "won't save us" or weather (increased water cycle) won't save us or simple thermal inertia in the big ice sheets or permafrost areas is insufficient to prevent melting within the next 100 years? I suppose part of the reason is that the bad physics people come here to argue their case and someone has to correct them. But claiming certainty about basic physics is not an answer to arguments that point out the uncertainties in climate science. For example, has anyone ever explained why models predicted a stronger polar vortex (less meridional flow) due to lower sea ice, now the models apparently predict a weaker polar jet and more meridional flow (due to lower sea ice). There are plenty of good threads on all of the issues that I have thought about here. That's where the real debate is, everything else is a "smokey back room" debate that does not belong in public.
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7. Cornelius Breadbasket at 21:35 PM on 20 April, 2012
   What an excellent topic - and fastinating to see such varied responses from Dikran, Glenn and Ari. I would very much like to see a WUWT response to Glenn...
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8. muoncounter at 22:51 PM on 20 April, 2012
   I particularly like Glenn's list. Compare it to a short list for 'the other side' to see how things 'balance' out: 1. No, its not. 2. Even if it is, it's not our fault. 3. Even if it is our fault, you can't 'prove' it. 4. Why? Because we know it's not. So there is overwhelming weight of evidence, logical consistency and thought on one side vs. very little beyond stubborn refusal on the other. Unlike Eric#6, I believe that certainty about basic physics is paramount and must be the focus of the real debate. Our argument stands with basic physics; theirs does not. Uncertainty about details is the stuff for the 'back room debate'; unfortunately, that is what gets dragged out in public every time there's another spring snowstorm or half-baked idea.
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9. Bob Lacatena at 23:19 PM on 20 April, 2012
   Contrast this with the WUWT post submitted by caerbannog. I mean, really... is Anthony Watts still attempting to promote as dead an argument as the idea that the source of CO2 increases in the atmosphere is natural? Really? He either truly doesn't get that simple, irrefutable fact (in which case the Comments Policy forbids me from saying more on that subject) or else he does know it, and is posting an argument like that any way (in which case the Comments Policy forbids me from saying more on that subject). In recent months we've seen a number of moderated "yeah, well, maybe, but..." comments from the likes of Spencer, Singer, Pielke Sr. and others. Each of them is trying to to some degree distance themselves from the indefensible, wing-nut, denial claims that make them all look silly (like arguing that the source of the added CO2 in the atmosphere is somehow natural in origin). They've tried to paint themselves as reasonable moderates in the center of the debate, while certain other factions at the edges are deniers (but no, not them!) or "alarmists." That by itself is silly, but... The wing-nut element is still there, and they still cling to it when they like, such as Anthony's latest post on CO2 levels, where he has the unmitigated gall to say:

   He elegantly shows that there is a solid correlation between natural climate factors (global temperature and soil moisture content) and the net gain (or loss) in global atmospheric content when the latter is averaged over a two year period. The hanging question remains, if natural factors drive more than 90% of the growth in CO2 how significant is the contribution of human generated emissions. The answer is simple… not very.

   I know why I trust my understanding of the science (which is different from knowing that I'm right), but the question that really intrigues me is... How do I know they're wrong? Because those in denial of anthropogenically triggered climate change are themselves inconsistent, or rather, they consistently argue the same thoroughly debunked topics. I know they're wrong because they try to score points and engage in propaganda rather than discussing the actual science.
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10. Eric (skeptic) at 23:41 PM on 20 April, 2012
    muoncounter, no doubt there is a lot of stubborn refusal to accept the possibility that we could warm into unknown and dangerous territory with doubled (or more) CO2. But your list is the "noise". The "signal" is how high sensitivity "stands with basic physics" (or not). You have no choice but to counter the noise as it lands in the media or on your doorstep, but it should not be the main focus.
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11. TOP at 23:43 PM on 20 April, 2012
    You have touched upon a major point in John Cook's book, "the Debunking handbook" that has always troubled me. The point of view that John took in the book was that one party was absolutely right and trying to convince the unconvinced to the truth of what that right notion was. Then I see Dikran Marsupial starting off with, "I don't think that we are sure that we are right, as science is never completely settled; we can be confident we are right because the available evidence very strongly supports our position*;" followed by Ari Jokimäki stating, "But in any case, I don't try to be right about anything.". These are positions close to my own and just don't jive with taking a position like John took in his book which seems to require absolute certainty. Glenn Tamblyn's position is much closer to John's IIRC.
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12. DSL at 00:04 AM on 21 April, 2012
    Eric - the focuses are tied together in a dynamic relationship. The stronger the evidence becomes for current estimates of sensitivity, the stronger the need to counter the bull**** with . . . well, a strong response. TOP - "certainty," for me, is that level of confidence that allows action to take place in good conscience. I make decisions every day that are based on less than certainty, and I worry about those decisions, but I am forced to act. The level of confidence I have in current mainstream estimates of sensitivity allows me to currently act toward mitigation in good conscience. How someone can, after having looked at the thousands of studies available and the history of the science, come to the confident conclusion that climate science is a hoax baffles me. If John is willing to publicly commit to the idea that "AGW is occurring and that is the absolute, unalterable Truth" then I'll buy a hat and eat it. I suspect he would rather say, "The overwhelming amount of work done by scientists suggests that AGW is occurring, and the suggestion is so strong that I can act as if it is the truth, even if I am still open to the idea that the science may be overturned." Show me a person who claims to have found absolute truth, and I will show you a person who is demonstrably wrong on a regular basis.
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13. Dikran Marsupial at 00:28 AM on 21 April, 2012
    To be fair to Prof. Salby, I gather he is an excellent scientist, it is just that he has made a serious error on this particular point. I suspect that the journal paper that was mentioned at the time has been quietly withdrawn by Prof. Salby after having seen that the various counter-arguments following his presentation are entirly correct.
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14. Tom Curtis at 00:57 AM on 21 April, 2012
    Dikran Marsupial @13, apparently this was Prof Salby's position on Feb 20th:

    "Dear Brian, Apologies for the belated reply; we’re on summer break here. The technical paper underpinning my presentation to the Sydney Institute has certainly not been withdrawn. The cycle of scientific publication is slow, typically about a year. For a subject as political as this one, it can be very slow. The fiasco surrounding Spencer and Braswell (2011), a thinly-veiled exercise in coercion, didn’t help. But, with patience, we will eventually get there. Upon formal release, a notice will be sent to the numerous interested parties. In the meantime, a couple of matters of possible interest: (1) About half of the material in the Sydney Institute presentation is developed in Physics of the Atmosphere & Climate, a peer-reviewed volume that is now out. Although developed for a technical audience, elements should be comprehensible to the non-specialist. Highlighted in the attached is material of relevance. (2) In the coming weeks, a video of the presentation will be made available through the Sydney Institute – inclusive of full graphics. Stay tuned. Murry Salby"

    So apparently, no he has not seen reason. But any difficulty he has with publishing is purely to do with politics and nothing to do with any flaws in the paper /sarc
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15. Bob Lacatena at 00:59 AM on 21 April, 2012
    13, Dikran,

    I gather he is an excellent scientist...

    I find this utterly impossible to accept. The concept that small variations can overwhelm a consistent but important underlying signal (i.e. natural variations paralleling global temperature swings versus regular, cumulative addition through human emissions) is literally the simplest thing in the world to grasp. No reputable scientist could possibly make that sort of mistake, and then trumpet it in public as an upcoming, landmark paper. At the same time, his failure to explain or even address where human emissions might have gone (if not into the atmosphere and ocean) as well as where the actual increase could come from (given that CO2 has never risen above 300 ppm in the past 800,000 years) is quite simply unacceptable. His argument amounts to the same denial argument with regard to temperature... an inability to distinguish a trend from the noise. This is basic, basic, basic. He demonstrates either willful ignorance or complete incompetence. In either case, "excellent" cannot come anywhere into this equation.
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16. dana1981 at 01:06 AM on 21 April, 2012
    Sphaerica @9 - to be fair, Watts has joined Singer and Spencer et al. in denouncing the 'sky dragon' hardcore deniers. That said, Watts seems to embrace virtually any other "it's not humans" argument on his blog, Salby's nonsense being the latest in an incrediby long line of ludicrous examples. But at least he did draw the line somewhere! Tom @14 - that's disappointing. After not hearing a word from Salby in 8 months I was hoping like Dikran @13 that he had come to his senses. Given his comments on Spencer and Braswell, clearly that's not going to happen. TOP @11 - I'm sure John would say the point of the handbook is that although we can't be certain, the scientific evidence does overwhelmingly support AGW, and that's what we need to communicate to people.
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17. Dikran Marsupial at 01:30 AM on 21 April, 2012
    Like Dana, I am disspointed to hear that he has not reconsidered. Sadly it seems he will be ruining an otherwise excellent academic career (see his publication record). Unfortunatly once someone has an incorrect idea in their heads it can be difficult for them to accept that they are wrong, counterintuitively especially of the proof happens to be very simple. I suspect being a genuine expert in one field makes one particularly prone to this (c.f. Dyson). If Salby's paper appears in a decent journal, there will be comments submitted, even if I have to do write it (again! ;o). I did post Salby a pre-print of my Energy and Fuels paper, but recieved no reply.
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18. Bob Lacatena at 01:57 AM on 21 April, 2012
    Dana, See, that's my problem. The more strategically minded deniers seem to have adopted the strategy that they can take and dismiss one, single, ridiculous position that is supported only by the nut-jobs of the world (the slayers), i.e. that the GHG effect violates the laws of physics. By so doing, they try to imply that they are the center, the denial nut-jobs are on one fringe, and the entire rest of the professional climate science community represents the other fringe. But they also continue to accept other utterly simple and easily refuted arguments, specifically whether or not the globe is warming (Watts on BEST, Spencer with his recent UHI analysis, Curry with too short a trend) and also -- and this is really, really just downright laughable -- the source of increased carbon dioxide in the atmosphere. I mean, really... the CO2 arguments are just so basic and simplistic that anyone who tries to go there should have a giant D (let's be nice and say that's for "dunce") branded on their heads... particularly if they are "excellent" scientists like Salby or Curry. Even Singer refutes the "natural CO2" argument in "Climate Deniers Are Giving Us Skeptics a Bad Name." I think it's time for scientists who are literally embarrassing the field to be publicly embarrassed themselves. I mean, it's almost a little too easy for me to accept that I'm right when the most "professional" and "excellent" scientists that are in denial are putting forward insanely stupid arguments (Salby on the source of CO2, Curry on Salby revolutionizing climate science, Spencer on surface UHI when his own work demonstrates the opposite in the troposphere). Why are we sure we're right? Because the deniers invest so much energy into coming up with things that are laughably wrong.
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19. sidd at 02:43 AM on 21 April, 2012
    1) What am I sure about? Simply put, I am sure that adding fossil CO2 to the atmosphere will warm the surface and I agree with the IPCC confidence limits on Charney sensitivity. 2) Why am I sure ? Because I have the math and physics background to understand the argument and the calculations. 3) What would it take to change my mind ? Some process would have to be discovered that masks the warming effect we expect from releasing fossil CO2, together with another process which causes the same amount of warming that we expect from releasing fossil CO2. I am reminded of "Through the Looking Glass" "But I was thinking of a plan to dye my whiskers green, And always use so large a fan, that they could not bee seen" 4) I am certain enough of 1) that I personally waste no time at all on trying to find mechanisms for 3) sidd
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20. TonyLo at 03:23 AM on 21 April, 2012
    Glenn Tamblyn has it right. Confirmation of our understanding of complex systems is based not on one empirical finding but on many different findings that are consistent or at least have not found to be mutually inconsistent--a kind of triangulation. So, anyone who rejects AGW must present an explanation that offers alternatives to well-established physics and chemistry--something that you never see from the deniers. Marsupial's comments are okay but for heaven's sake do not cite David Hume, the causality denier, in support of science or scientific thinking.
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21. Dikran Marsupial at 03:34 AM on 21 April, 2012
    David Hume established that causal relationships cannot be proven by empirical means. That is as true today as when he said it, and his aphorism about the treatment of evidence is equally correct today a it was then. So Hume wrote things that appear naive from today's perspective? Lets not throw the baby out with the bath water! ;o)
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22. william5331 at 05:52 AM on 21 April, 2012
    Let's say, for the sake of the argument, that all the scientists are wrong. It has happened before. As recently as when I took Geology 101 in the 1959, my Geology professor, the head of the department, said that plate tectonics was nonsense. So what other reasons are there for slashing our use of fossil fuel. http://mtkass.blogspot.co.nz/2010/10/forget-climate-change.html
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23. KR at 06:20 AM on 21 April, 2012
    william - "Let's say, for the sake of the argument, that all the scientists are wrong. It has happened before." And every time that has happened, it is because a different theory explained the data better than the previous one. When plate tectonics was proposed based on continental edge matching, the theory lacked a mechanism. Only when a mechanism (movement of magma, continents floating on that substrate) was proposed did plate tectonics become a viable theory, one that explained those edge matches without arm-waving. The 'skeptics' appear to be sadly lacking in any such theory. There are lots of half-backed hypotheses through around, most of which are mutually contradictory, and none of which explain the data better than our current physical understanding. In fact, most require ignoring the majority of the evidence - because these hypotheses are incompatible with observations. Glenn Tamblyns list is an excellent start on the range of observations and theoretic domains that new hypotheses must be compatible with. In the meantime, given the quality of the hypotheses thrown around by the 'skeptics', I am reminded of a particular quote: "At times one remains faithful to a cause only because its opponents do not cease to be insipid." - F. Nietzsche
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24. danielc at 07:02 AM on 21 April, 2012
    Repeatable observations. Period. Full stop. I've never met any of you, but I have access to a mass spectrometer, I know how to use it, and I know the implications of measured values and changes and trends in 18O and 16O, 13C and 14C, Hydrogen and Deuterium...and so on... I can measure them myself. I can do the physics myself. I can repeat the experiments and observations in the classic papers from 150 years ago on forward, and as if by magic, I get the same results they do!! WOW!! "Consensus" is different from "Scientific Consensus" - "consensus" means we all agree that the Red Sox are the best baseball team and the color green is far superior... Scientific consensus means that we all can measure similar things, get similar data, show similar trends and that 2+2 = 4. I know that humans are contributing to atmospheric carbon because I can measure the relative proportions of isotopes of carbon through recent and geologic time... I can measure the change in 13Carbon, and the drop in 14Carbon as older light carbon is added via fossil fuel burning. I know that 18O is heavier and is preferentially left behind on evaporation and preferentially deposited during the initial rain-outs. That the ice in glaciers is enriched in 16O... that the Oxygen that critters make their shells from reflects the isotopic composition of the extant water they live (and die) in. That their shells therefore reflect changes in 18O/16O ratio, which is a function of the ratio between evaporation, rain-out and glacier melt over space and time. I can state those as observations, and whether you know me or not, like me or not, think me a complete wanker who stupidly likes the red sox and the color green... you can measure the same thing... and if we're both competent and honest, we will come up with remarkably, magically similar curves through time.
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25. mattho at 07:04 AM on 21 April, 2012
    A very relevant debate! There is however one fault on both sides: We often confuse denial with skepticism thinking they mean the same. Most people mean by: I am a Climate Change skeptic that they don't think it's happening, or not human made and/or not bad in any way. However skeptic really means to be seeking truth, and not - as most fake experts do - assume they already found it. This is well presented in the recent book: CLIMATE CHANGE DENIAL by H. Washington & J. Cook (2011)
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26. Rob Honeycutt at 07:04 AM on 21 April, 2012
    William @ 22... Greenhouse theory happens to date back 100 years earlier than does plate tectonics. Greenhouse theory explains a whole lot of things we see including glacial-interglacial cycles and snowball Earth events. AGW is merely an extension of that saying that if WE add the CO2 into the atmosphere (instead of it happening naturally) then we should see similar and proportionate responses in our climate. If you take away greenhouse theory you're left with a whole lot that just can't be explained any other way.
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27. climatehawk1 at 07:10 AM on 21 April, 2012
    Quark Soup has an interesting thread on this topic today. It's about conversations with Dyson and Happer on the basis for their dissent.
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28. scaddenp at 07:32 AM on 21 April, 2012
    "The point of view that John took in the book was that one party was absolutely right and trying to convince the unconvinced to the truth of what that right notion was" TOP, I think is more the point that most of what "skeptics" produce is absolutely wrong. If this was a real scientific debate (with peer-reviewed paper supporting multiple viewpoints), then you would have a valid point. The real science is hardly ever debated.
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29. noelfuller at 07:53 AM on 21 April, 2012
    from Ari Jokimäki: "I'm on the side that doesn't want to believe anything and thinks that research results should tell us what's happening and possibly what to do about it, if there is such a need." I compare the above with the following: "I taught you not to believe merely because you have heard, but when you believed of your consciousness, to act accordingly and abundantly." - the buddha Gautama The big problem with understanding climate beyond awareness of seasons, and differences while travelling, distinguishing it from weather, is that we are not personally conscious of climate at any large scale. Yet science extends our senses. Science, as in climate science cultivates a form of group consciousness. By it we may "believe of our consciousness" and hopefully "act accordingly and abundantly" Noel
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30. JimF at 08:03 AM on 21 April, 2012
    Well, this whole article depresses me. I'm not a scientist, but I have been active trying to get local pols to finally react to the danger we are facing. But on this post, this is kind of what we get: "I don't think we are sure that we are right..." "Right about what?" "Let people decide if they want to do anything..." "I haven't made up my mind (we have to do anything about it.." That's it? The skeptic side through the Limbaugh's and climatedepot's of the world say definitively that AGW is a HOAX, that scientists who believe it are lying, and that climatology is bought off. Not a lot of equivocation there! And we are expected to go to battle with "I haven't made up my mind yet...?" Yikes. No wonder more and more people in this country don't accept the reality of AGW.
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31. noelfuller at 08:05 AM on 21 April, 2012
    Sphaerica "He either truly doesn't get that simple, irrefutable fact ... or else he does know it, and is posting an argument like that any way ..." You might value this quote from Plato: "... there is simple ignorance, which is the source of lighter offences, and double ignorance, which is accompanied by a conceit of wisdom; and he who is under the influence of the latter fancies that he knows all about matters of which he knows nothing. This second kind of ignorance, when possessed of power and strength, will be held by the legislator to be the source of great and monstrous [crimes], but when attended with weakness, will only result in the errors of children and old men; ..." Athenian stranger - Plato, Book of Laws, Book IX Translated by Benjamin Jowett Noel
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32. noelfuller at 08:11 AM on 21 April, 2012
    On uncertainty Dikran Marsupial said "In my opinion, a rational cost-benefit analysis, when all relevant uncertainties are properly taken into account, strongly advocates action to mitigate the effects of AGW, rather than adaption when it is already too late." I would ask a person who raises this matter to use a wooden rule, or a dressmakers tape, to measure a distance, supposed to be a gap in a bench say in which a fridge is to go. I would then ask the subject as to certainty in the measurement. Was it read to the nearest millimeter? Could it be read more precisely? How accurate is the instrument of measurement compared to the internationally agreed standard measure? Has the coefficient of thermal expansion been considered in the result? Would it be wise to order a fridge to exactly fit the measurement? What uncertainty should be allowed for in ordering the fridge? Would you decide not to order a fridge given these uncertainties, or is your measurement good enough to act on? Noel
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33. Steve Case at 08:26 AM on 21 April, 2012
    Glenn's list is a good one for the basics of the greenhouse effect, but I should like to know if he's sure he's right about the positive feed backs that elevate CO2 Climate Sensitivity from the basic 1.2°C to 3°C or more.
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34. danielc at 08:40 AM on 21 April, 2012
    @ Noel #32: The consequences of inaction = not having a fridge. Result, spoiled food. The consequences of ordering a fridge that is too large = dealing with the problem while eating fresh and properly cooled food. One consequence is annoying, but tenable... the other is potentially deadly. On climate: the consequences of mitigating emissions and the atmosphere may be expensive, however the side benefits: cleaner power sources, alternative energy technologies, innovation and the creation and burgeoning of potentially huge markets may well offset any short term annoyances. The consequences of doing nothing are by most measures serious, by many measures dangerous, and by some measures, potentially catastrophic.
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35. Rob Honeycutt at 09:00 AM on 21 April, 2012
    Steve Case @ 33.... There are several dozen studies that show this to be the case. See IPCC AR4 WG1 chapter 8.6. In general, you'd have a really hard time explaining glacial-interglacials without feedbacks, along with a host of other things, through which climate sensitivity is measured.
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36. Rob Honeycutt at 09:07 AM on 21 April, 2012
    When the IPCC states that climate sensitivity below 1.5C is unlikely, they are basing it on a lot of data from a lot of sources. The more interesting recent research on this topic has been essentially clipping the long tail of the distribution. In AR4 they stated that sensitivity above 4.5C could not be ruled out, but newer research is starting to rule it out. Which is a very good thing. 4.5C is ominous enough for me. Hell, 3C is pretty darned ominous as well.
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37. muoncounter at 09:38 AM on 21 April, 2012
    This is not a sensitivity thread; that's a fine point of the type Scott Denning cautions against. Whether or not we have established the exact sensitivity does not alter the basic facts. Physics doesn't care.
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38. dr2chase at 10:25 AM on 21 April, 2012
    It may not be a sensitivity thread, but sensitivity modifies our alarm, and the degree to which it matters whether we are right. Very low sensitivity means it doesn't really matter.
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39. muoncounter at 10:58 AM on 21 April, 2012
    In case you missed it, we're well past the point of 'very low sensitivity.'
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40. LazyTeenager at 11:30 AM on 21 April, 2012
    The thing which seals it for me is climate skeptic tactics. 1. Relentless attempts to discredit climate scientists or in fact any one who nay says their debating points. 2. Reliance on debating points which are wrong and which they show no inclination to verify for truth. 3. Persistent use of logical fallacies. 4. Cheating and manipulation by a significant number of climate skeptics, particularly the politicals. 5. Consistent promotion of crank science. 6. Lots of arm chair philosophy, but very little science even if you could do the experiments in your kitchen or basement. If they had a strong position they would not need to do any of that.
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41. Brendon at 12:22 PM on 21 April, 2012
    I believe in AGW and I think I am correct. However this is not my opinion, I just go with what the science is telling us. If new research were presented that showed us why AGW is not a concern, that some strong negative feedback will prevent higher temps, then so long as it were scientifically sound and withstood the test of proper peer-review, then my "belief" would also change. At the moment that seems unlikely for both warming and acidification. Uncertainty however, is not reason for inaction or complacency.
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42. barry1487 at 12:49 PM on 21 April, 2012
    JimF@30, An acquaintance who is a scientist that studied under John Houghton allowed me to question him about the greenhouse effect and AGW. I mentioned skeptics, and looked for his opinion. I had a couple of long chats, and came away with the realization that he had not given me any kind of position at all on the matter, only what he thought were relevant scientific points (Ari's reply in the OP smacks of). I didn't know what he thought about the 'issue'. "Here," I thought at the time, "is a scientist." (Not long after, one of my (arts) students after 6 months of informal chats in the classroom and pub on climate change, complained I'd said much but given no opinion. I was surprised and pleased as punch - but didn't mistake myself for a scientist :-) I think skepticalscience treads a line between science and activism. Dikran's response was the one I related to most. His clear concession to uncertainty inspires the most trust in what he might say. Whereas the bald certainty of much 'skeptic' commentary inspires no confidence from me. I sometimes make the argument that greater uncertainty is actually a greater impetus to do something. If the hazard is potentially lower because we don't know the bounds as well as we thought, that also means (naively) that the hazards are also potentially greater. But this is not a good 'sell' for an activist, because action is encouraged by bold statements, not deference to uncertainty. The irrational 'skeptics' equate uncertainty with lowering the bottom AND top end of the risk scale instead of widening it.
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43. Fran Barlow at 15:33 PM on 21 April, 2012
    It's quite simple really. The phenomenon -- in this case climate change -- can only at this stage be explained if we accept greenhouse gas theory. No other explanation can hindcast the data. If someone can offer a credible and testable alternative explanation for the data that has been measured (including the energy balance data, then I would have some doubt. They'd probably also have to show that both GHGs and this other hitherto undiscovered phenomenon exactly affected the radiation in the same bandwidths as GHGs so that both could co-exist without being additive. It's also clear that if there were some other way of explaining the data that, given the enormous interest in maintaining business-as-usal that pretty much every first world government (and quite a few non-first world governments) has -- that someone would have found it by now. Nothing would help them so much as a plausible alternative theory. Yet to dat, they have nothing. Nada. Given that we have a theory that explains the phenomenon of climate change very well, and no alternative with any credibility, the conclusion is forced. If there were no implications at all for public policy, we might well say "isn't that interesting?" and move on. Of course in that case, the denier movement would be about as active as people who argue that Shakespeare wasn't really the author of Shakespeare's plays. The problem here is one of equivocation. It is so that one cannot prove causality. There is an inevitable bootstrapping problem. The close association with science of maths inclines people to think that scientific proof must be the same as proof in maths. Of course, it isn't because maths is a closed system with deductive reasoning, whereas science is inductive -- we gather more data and rule out explanations that are not plausible leaving behind what may well be truth. Science however is mainly focused on utility -- knowledge about the world that is useful to humans. We would like truth, but we accept that even if we get it, we won't be absolutely certain we have it. What we do want from science are useful insights that can steer us away from doing things that are harmful or sub-optimal. Science doesn't need to give us truth in an absolute sense to meet that standard. It only has to give us the best guidance that rigorous observation and inference-making can achieve. For us, that will count as proof because any human response that is based on that will either be optimal, or sub-optimal in ways that reflect the incompleteness of our work or the limits of our technology. We are doing the best we can with what we have. That is why the objectors to mainstream science are wrong. Of course we can't say with the certainty that attends religious faith that the science as it stands can never be refuted. What we can say is that to reject using what we are very confident is the best explanation for climate change to guide public policy would be a reckless course, on par with ignoring traffic signals on the basis of doubts one had about the consequences of such a course. No court would acquit someone behaving like that on the basis of doubts about the physics and localised impacts of potential collisions. Stripped of the sophistry, the denier claim is incipiently epistemically nihilistic. If the mere partiality of insight makes insight worthless, then all insight is worthless at least until one can show that it is whole and complete. Of course, by definition, one can't have complete insight save by the route of partial insight first. Nobody could know anything and the "skeptic" case would by their own standards implode into nothingness. If they were consistent, they would joing trappist monasteries and take a vow of silence. Of course they aren't consistent. Nobody outside of a mental institution behaves as if the world isn't knowable -- at least in part. Every bit of human progress has been built on partial insight, and it will continue to be so. Intrepid humans have tried things out, sometimes to their personal cost but almost always to the beneift of those who could learn both from their triumphs and their failures. We, more than any other species have learned that learning is a good and worthy thing, to stand on the shoulders of those who have shed light where there is darkness and to spurn those who prattle from the margins that we humans are the playthings of fate. The IPCC-consensus is for mine amply proved to scientific standards. Future science may refine it and make it even more useful as a guide to policy and in the very unlikely event that it is overturned, it will be because someone using the very tools that got us to this point, wielded them even more impressively, not because some self-serving loudmouth did an impression of Mr Horse.
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44. Fran Barlow at 16:15 PM on 21 April, 2012
    One more thing -- data and schedule feasibility. In the real world, data must not only be accurate and salient. To be useful, it must be timely. By timely, we mean that it is available and can be processed in time to inform action. Sometimes, when I'm on hold on the phone, I play a game called "Quadropops". It's a spawning game in which one tries to keep the spawn at bay by continually manipulating the spawn into patterns in which four of the same colour are all in contact. When that occurs, they disappear and any resting on them fall to the next point and if another group of four arises they also vanish. As one accumulates more points, you level up and the spawn comes faster and includes blockers that can only be destroyed by putting one of the four beside them. These two constrain your choice raising the degree of difficulty. By the time you get to level 10 if the spawn have built up much beyond half way, you have no time for careful modelling or the available data. You might have just enough time to work out where things should go but if you take it, they will spawn too early for you to direct them efficiently and you lose control of the game. The basic point is the value of even salient and accurate data is substantially a function of your ability to deploy it to serve an end. The less time you have to process it and develop responses based on it, the less valuable it is. It would have been better to have had less accurate and less salient data a lot earlier providing the extra time you had allowed you to make better use of it. In the case of climate change, while there is continuing marginal value in seeking to narrow error bars in areas where uncertainty remains, the reality is that the marginal value in trying to refine the theory before taking action, in areas where uncertainty is for all practical purposes, frivolous, is negative -- and if the current projections are on the optimistic side, perhaps catastrophically so. How much better off would we be going from 95% certainty to 99% certainty, if, while we waited to act, we also became more certain that the previous modelling was excessively optimistic and that we had a chance of foreclosing some of the harm if we'd simply acted earlier? We'd have to conclude with hindisght that our search for ever more impressive certainty had been very costly indeed, even though we now had it.
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45. bill4344 at 17:57 PM on 21 April, 2012
    I don't know I'm right. I do not have the science background to confidently assert that I understand the maths and physics sufficiently to be able to know with certainty on which side the evidence lies. What I do know is that I can spot where the balance of evidence must lie if one impartially observes the behaviour of the qualified protagonists. One side has a case that is coherent, consistent, and while it contains gaps, those gaps are acknowledged and are not sufficiently large to justify inaction in such a crucial matter. (Particularly as we must establish a 'post-fossil' economy at some stage, anyway!) On the other we have quibbling, and a myopic and frequently-selective obsession with uncertainty that, as Fran Barlow points out above, borders on outright nihilism, and is never consistently applied to the remainder of human knowledge in any case. And that's the strong, merely contrarian, part of the counter-argument. The bulk of what really is a Denier argument is based, it appears to me, on a single logical fallacy - argument from the undesirable consequences of an idea. AGW implies the Free Market, and all the goodies it showers me with, must be constrained; the Free Market must never be constrained: therefore there can be no AGW. Anyone who says there is is clearly an enemy of the Free Market. And of Freedom.™. (Frankly, I'm with Žižek - it's easier to imagine the End of the World than the End of Capitalism! In fact, we may yet find out which is more likely! That's why I sincerely hope there are indeed workable market-based solutions to this problem, and why I also cannot understand the marketeers hysterical opposition to implementing them. How heavy-handed are actions deferred until 2030 going to have to be, do you think?) This results in the egregious conspiratorial nonsense promulgated by the likes of Monckton and Delingpole, which is as risible as anything dished up by the 911 Truthers. And yet these are shining lights in the so called 'skeptic' movement! The 'skeptic' movement tolerates the most alarming tosh without ever seriously cleaning house of the complete nutters, reverts to the beginning of the argument without warning (e.g. Humans not causing the CO2 increase!), and provides absolutely no coherent counter-narrative. It's hardly likely to, in the circumstances. In short, it acts, even at its best, like a law firm hired to defend a rich and well-connected white guy called CO2, and then there's the vast and noisy fools' gallery on Fox and the blogs cheering for 'their guy' to get off! Here are some other truths: If the AGW theory is wrong, we will find out. If the AGW theory is wrong, we'll feel like crap, but we'll accept it, some more quickly than others, but most of us will, eventually. And the evidence that convinces us of this won't come from flaky blog-posts, pal-review, or the 'tear-up Physics' brigade; it will come from proper, stringent, peer-reviewed, hard-scrabble science. Because that's the best evidence of anything we'll ever have. But if you're waiting for 100% certainty before you act, and act decisively, in this matter you really are a fool to yourself and a burden to others. Including - in fact, especially - your own grandchildren...
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46. jzk at 21:18 PM on 21 April, 2012
    bill @ 45, "AGW implies the Free Market, and all the goodies it showers me with, must be constrained; the Free Market must never be constrained: therefore there can be no AGW. Anyone who says there is is clearly an enemy of the Free Market. And of Freedom.™." The problem with that statement is that all environmental concerns would fall into that category. In a free market society, there is no other way to protect the environment other than regulation. The reason is that the environment can't be "owned" but rather it is "shared." Typically, when something is shared by a great number of people, care for that thing ends up lacking. Look at public restrooms for example. People leave their mess there thinking someone else will take care of it, or even just have no concern about it in the first place. Thus, protection of the environment by regulation is essential in a free market system. But we must get it right. I don't think you are going to get many that would argue "Yes, emitting CO2 is very harmful to the planet, but nevertheless, I have the freedom to emit as much as I please."
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    Moderator Response: [DB] Politics are Off-Topic on this thread.
47. bill4344 at 21:51 PM on 21 April, 2012
    jzk @ 46- Not many environmental concerns impinge upon something as central to the capitalist economy as it's fossil-fuel-based energy heart; this isn't, say conservation of some high-biodiversity area (I've been directly involved in campaigns that have secured such protections - specifically removing the mining industry - from more than 700 000 Ha of high-quality wilderness), or restricting the production of CFCs. These things hurt, and you get lots of resistance, but they don't threaten the core of the beast.

    Thus, protection of the environment by regulation is essential in a free market system.

    For a start, the Republican Party in the US seems to increasingly believe that regulations, and particularly environmental regulations, have no place in a Free Market economy. And where they go, the rest of the corporate Right (aka 'conservatives', ironically enough) will almost certainly follow; in the Anglo world, anyway. In fact, this process is already becoming evident here in Australia as the mining industry, and specifically its most reactionary sectors, is beginning to very publicly throw its weight around, with denying AGW as a key focus, and with all the attendant anti-Greenie baggage rolling along behind.

    I don't think you are going to get many that would argue "Yes, emitting CO2 is very harmful to the planet, but nevertheless, I have the freedom to emit as much as I please."

    I do think you get many who will say "As long as it is an inherent externality stemming directly from my own affluence I demand the freedom to emit as much CO2 as I please; therefore emitting CO2 is not harmful to the planet. You only want to take my right away because you hate my freedom and envy my affluence." This is, in my experience, the single most common Denier argument one will encounter on the internet, but cognitive dissonance of course means that they will never state it quite so bluntly. But they do come amazingly close... PS: You haven't seen all the 'This blog belches carbon' icons? What sort of sociopathy are we talking there? May I also suggest you read David Michaels' Doubt is Their Product? You may simply have no idea just how many of even the most reasonable - nay, essential - regulationist arguments we have already lost, with virtually no public fanfare...
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    Moderator Response: [DB] Politics are Off-Topic on this thread. Other threads exist that cover the focus you discuss (such as this one).
48. MA Rodger at 23:22 PM on 21 April, 2012
    In the post Ari Jokimäki: begins his contribution "My first thought on Rob's question is: right about what?" It's a question that hasn't been answered here & in places this comment thread does stretch the argument beyond solely the science. In my view, being "Right about AGW" begins with the no-brainers which the likes of Lindzen agrees is settled. I then go beyond to dismiss what I see as the falacious assertions of Lindzen on climate sensitivity & the role of natural causes in the temperature record of recent decades. The final step within the science is to link emissions for likely 'sensitivities' with actual physical impacts (sea level rise, regional/seasonal temperature/rainfall), thus to show at what point Bangladesh drowns or Java melts under the business-as-usual futures. My view on this is far less well founded. I 'believe' that even a sensitivity of 1.5 would lead to unacceptable consiquences, but such a 'belief' does depend on the next step which extends beyond science. Beyond the science there is the question "So what do we do about it?" and that has attracted just as many crazy & not-so-crazy denialist arguments for doing little or nothing, almost as many as the science has. One big difficulty is that the scientific agruments are now replaced by economic, technological and political arguments which provide a far less disciplined environment for a debate that involves so much uncertainty. And in explaining 'why I'm sure I'm right' beyond the science is something I'm a lot less practised in.
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49. JimF at 00:33 AM on 22 April, 2012
    barry@42 Thanks for responding. I see your point. But this really frustrates me. The responses are just too theoretical/mathematical/technical...or something like that. This battle is not being waged liked that. We're in a battle for the 'hearts and minds' of the American people (in the US), and the above responses to a question like "Why are we SURE we are Right" just don't cut it. There was no 'surety' at all. I read something a year ago that a group of scientists were going to be much more active in warning the populace: going on TV and radio, writing articles, etc. Engaging the fight in the media, if you will. In other words, stepping out of their "we just do the study, you decide" mentality. If the above responses are an indication of that, we're losing. They will not convince anyone, I don't think. Color me disappointed.
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50. adelady at 01:13 AM on 22 April, 2012
    OK. If we're talking who's right and who's not, which of the Australians here is up for Thursday night's climate extravaganza on the ABC. I'm promising myself I _will_ grit my teeth and watch the Q&A, but if I watch the preceding hour of Nick Minchin trying to "change my mind" about climate science I may not have a TV to watch later. He's enough to make me throw stuff.
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