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Comments 27701 to 27750:

27701. ryland at 21:21 PM on 6 August 2015
       We are the Asteroid - Scientists’ Heighten Concerns About Global Extinctions
       

       One Planet Only Forever @2. Your exposition, enhanced by your MBA training and life experience, doesn't address the crucial question. How will any government persuade its citizens to give up their aspirations for themselves and their families and accept a reduction in their standard of living and in their prospects for the future? You state "Appealing to emotion is far more powerful than appealing to reason" and a very strong emotional appeal to humans is their current and future personal economic well being. Serious attempts to reduce either are likely to be met with equally serious opposition.

       On another topic. In the piece from Yale Climate Connections it is stated "the rate of species loss the world is experiencing is “much much higher” than the rate at which species naturally originate, with the inevitable result that global diversity is being reduced. Kump of Penn State says the current rate of species extinction is 10 times that of massive extinction events that have occurred previously, and he points to climate change and the high incidence of volcanoes as a “common threat” in those extinctions"
       However it is also stated that "And Ceballos says an under-appreciated concern is that there are countless species of plants, animals, and microbes on Earth that humans do not even know about: so many species not having a scientific name that “we don’t even know” the extent of the losses".

       So if humans don't know about "countless species" how can we possibly know the current extinction rate is greater than 10 times that of previous massive extinctions? How can we possibly know the extinction rate is greater than the the rate at which species naturally originate? If you don’t know what you’re dealing with any comparisons are purely guess work. Realistically any comparisons can only be based on known species but perhaps the unknown species aren't being affected. Who can definitively say one way or another? And for that matter how can the true magnitude of the previous extinctions be assessed as again there would have been many unknown species?

       And one fnal question. Was it volcanoes or climate change that had the greater impact on previous extinctions?  If volcanoes then current attempts to reduce global temperatures may not be as productive as is believed in reducing species extinctions  

27702. One Planet Only Forever at 13:03 PM on 6 August 2015
       We are the Asteroid - Scientists’ Heighten Concerns About Global Extinctions
       

       My interpretation of the thoughts of Naomi Klein and many others is that the awarness of the unacceptable things going on in human societies and economies being raised by climate science, and other developing better understanding of the unacceptability of what has been developed, must lead to a significant change of what is valued and how its value is determined.

       Humanity developing to be a sustainable part of a robust diversity of life on this amazing planet has always been the only viable future for humanity, regardless of the impressions of prosperity that can temporarily be created by pursuits based on profitability and popularity.

       My MBA training and life experience help me understand that economically it is possible to have an advanatage if you are willing to try to get away with doing something you know is unacceptable. It will always be cheaper (and therefore more profitable and more likely to be popular), to do something less safely or more wastefully or to create more harm "if you can get away with it".

       Some major changes are needed so that the climate, and so many other things, do not continue rapidly changing due to the pace and rapaciousness of human pursuits. The current rules made up by humans have led to unacceptable developments at an unacceptable pace. Those rules based on the supremacy of profitability and popularity are clearly a failed experiment producing a reaction that is difficult to curtail or even slow down.

       That perpective raises serious questions about the legitimacy of the wealth and power of many of the currently wealthy and powerful. That is why attempts to better understand what is going on and raise awareness of that better understanding face attacks that are based on the rigorous science of manipulative misleading marketing. Appealing to emotion is far more powerful than appealing to reason.

       Unlike the hard work of science striving to better understand something and then sharing that an understanding that may be contrary to what many people prefer to believe, misleading marketing just requires appealing stuff to be made up as much as can be gotten away with for as long as it can be gotten away with. After all, there is lots of perceived, but likely unjustified, wealth and power at stake.

27703. denisaf at 11:27 AM on 6 August 2015
       The most influential climate change papers of all time
       

       This is an interesting review of the progress in the view of scientists of the nature of climate change. However, the important issue is how much understanding do the leaders of society have of the irreversibility of the rapid climate change and ocean acidifcation that is underway. They need better understanding so they wiil promote both policies to reduce greenhous gas emeissions as rapidly as possible as well as measures to cope with the consequences, such as sea level rise and increased storms, floods and wild fires.

27704. Rob Honeycutt at 09:43 AM on 6 August 2015
       We are the Asteroid - Scientists’ Heighten Concerns About Global Extinctions
       

       I had never before made the connection that a loss of a species is a loss of genetic information accumulated over billions of years.

27705. bozzza at 13:08 PM on 5 August 2015
       It's methane
       

       So, you are saying why Carbon-Soil Initiatives will never be an accepted method to combat climate change?!!?

27706. Tom Dayton at 05:56 AM on 5 August 2015
       Statistics says the long-term global warming trend continues
       

       A good source of links to explanations of issues with satellite temperature measurements is a comment by Christopher Hogan on RealClimate.

27707. One Planet Only Forever at 05:29 AM on 5 August 2015
       Statistics says the long-term global warming trend continues
       

       knaugle,

       The main point about the UAH and RSS history is that neither of them represent to surface temperature. They represent the temperature higher in the atmosphere where there is less effect of increased CO2, hence a smaller trend.

       Mind you, the higher elevation values have shown much more response to a strong El Nino such as the 1997/98 one. If the current El Nino builds to a similar level then the sattelite data may cease to be a favorite denier reference, at least until several years after this inconvenient event when they can once again claim "there has been no warming since 2016 so all of the science is wrong".

27708. knaugle at 02:22 AM on 5 August 2015
       Statistics says the long-term global warming trend continues
       

       You get a slightly smaller warming trend with the RSS satellite data, but there it is a lot easier to "cherrypick" and claim no warming at all the past 20 years.  I do think any article like this needs to at least address the difference, because I know a lot of deniers definitely point to it.

27709. bartverheggen at 01:02 AM on 5 August 2015
       2015 SkS Weekly News Roundup #31C
       

       I wrote a detailed reply to the claims made by Fabius Maximus regarding our PBL survey. It comes down to the first question having an effective plateau value at 78% if you include all respondents, since so many answered "don't know", "unknown", or "other". We have good reasons to believe that this was because the question was difficult to answer to the level of precision required by the answer options. Talking that into account, and looking at responses from both Q1 and Q3 leads to the conclusion that indeed there is a strong consensus.

27710. deathtokoalas at 18:46 PM on 4 August 2015
       It's methane
       

       the more important point is that agriculture itself (minus land-use issues, transportation, pesticides, etc) should be carbon neutral, in the long run. the methane only takes a few years to decay back into c02, and then it gets recycled. if you ignore the transportation, and you take the pesticides out, and you offset the land-use with new planting, there isn't a net increase - it's just a redistribution from the soil to the trees, which can then be pulled back to the soil.
       
       this argument is still floating around. that's the key point in combatting it: the only net source of carbon into the atmosphere is from underground, that is fossil fuels. organic farming with proper offsets for clearing is (excluding transportation issues) actually carbon neutral in the long run.

27711. bozzza at 12:55 PM on 4 August 2015
       Statistics says the long-term global warming trend continues
       

        I think the Arctic sea ice looks like it's disintegrating. My rationale is that stagnation is close to death and sinusoidal waves seem to be forming around the lower 2-standard-deviation boundary in the Arctic sea-ice extent graphs.

27712. chriskoz at 12:24 PM on 4 August 2015
       Statistics says the long-term global warming trend continues
       

       Tamino's blog post is much richer in details rather than this Guardian article. The original blog is dated 30 Apr, so 2 months before the paper by Foster & Abraham. Essentially the paper is the "polished out" version of the blog. I enjoyed reading the blog not only for Tamino's expert teachings but also for his juicy comments re those who deny the science

27713. ubrew12 at 06:33 AM on 4 August 2015
       2015 SkS Weekly News Roundup #31D
       

       For anyone interested: here's another set of climate info and links for this week from Mary Ellen Harte at Huffington Post.  

27714. michael sweet at 03:53 AM on 4 August 2015
       Statistics says the long-term global warming trend continues
       

       Grant Foster (Tamino) is the coauthor on this paper.  Much of the data in the paper have been posted on Open Mind, Tamino's blog.

       It is interesting to see how the other papers presented address the question of what a "haitus" is and how it can be measured.  Hopefully after 2015 the haitus will be resolved in the popular press, but the "skeptics" will probably keep it going as long as they get traction.

27715. jgnfld at 01:23 AM on 4 August 2015
       Statistics says the long-term global warming trend continues
       

       H'mmm.  Competently done statistics never suggested otherwise. Tamino, among others, has pointed this out on many occasions.

       
       Cherrypicking is always incompetent whether done by deniers or physicists not well trained in statistical inference.

27716. makiem at 13:18 PM on 3 August 2015
       Climate Data for Citizen Scientists
       

       Climate agencies provide a great service by putting their data files online, however, the organization and format of these files often makes it challenging for citizen scientists to compare series.

        

       Moderator Response:

       [PS] Commercial link deleted. If this account is used for spam, then it and all associated posts will be deleted. One and only warning.

27717. Tom Curtis at 09:58 AM on 3 August 2015
       2015 SkS Weekly News Roundup #31C
       

       If anyone is interested, "The editor of Fabius Maximus" has participated in a discussion of this topic at And Then There's Physics.  As part of his participation, he tried to indicate why he thought his mathematical prestidigitation was significant.  I responded:

       "Editor of the Fabius Maximus website:

       “Yes, I agree with this formulation. I believe that’s what I said. The dimensions of climate scientists’ consensus is a vital input to the public policy process. These surveys provide a valuable check on the IPCC.
       ….
       I don’t see much value in examining these things under a microscope. The headline result (combining 1a and 1b) is what it is, providing a direct comparison to the keynote finding of WG1 of AR4 and AR5 — and for comparison with the many other similar surveys (which this improves upon).”

       Complete nonsense.

       The IPCC result is the work of specialists in attribution studies surveying the relevant literature over a 12 month period, and distilling the results of that literature into a report. It is not, and is not intended to be a survey of the consensus opinion of all ‘climate scientists’, where the later is so loosely defined that a geologist being a coauthor of a single paper discussing paleoclimate counts as a “climate scientist”, ie, the effective definition for the Verheegen survey (once the “unconvinced”, ie, those invited to respond solely because of their expression of a political opinion on the web, and without regard to actual study of, or publication in regard to climate science).

       If you wanted a double check on the IPCC on attribution, the proper method is an independent literature survey on attribution. As an approximate alternative, you could survey the opinion of climate scientists who specialize in attribution studies asking them as to:

       1) Central estimate of the percentage contribution of anthropogenic (and/or GHG) to recent warming;
       2) Their upper and lower bounds at 90 and 95% confidence on the attribution;
       3) Their estimate as to the proportion of attribution experts whose central estimate lies within the IPCC value; and
       4) Their estimate of robustness of the evidence in favour of their opinion (ie, how likely they think it is that their view of the central estimate will have changed significantly with 10 more years of information).

       A general survey of climate scientists and deniers without regard their expertise in attribution is not a check on the IPCC.

       What the Verheggen survey is a check on is not the literature surveys such as Cook et al, but on the misinterpretation of the literature surveys which treats them as surveys of scientists rather than of papers. It is also an update and check on Doran et al 2009, which found that:

       “Results show that overall, 90% of participants answered “risen” to question1 and 82% answered yes to question 2.In general, as the level of active research and specialization in climate science increases, so does agreement with the two primary questions (Figure1). In our survey, the most specialized and knowledge-able respondents (with regard to climate change) are those who listed climate science as their area of expertise and who also have published more than 50% of their recent peer- reviewed papers on the subject of climate change (79individuals in total). Of these specialists, 96.2% (76 of 79) answered “risen” to question1 and 97.4% (75 of 77) answered yes to question2.”

       Note that the finding of Doran et al that agreement with the consensus rise with both specialist knowledge of climate science and with increased publication (as a proxy of greater expertise). The appropriately corrected percentage of agreement (74% among climate scientists; 84.5% among those having published 30 or more papers) are less than the nearest corresponding result from Doran et al. That may be because of the more precise nature of the questions, or may be due to a decline in certainty. The first is almost certainly the case, but the second cannot be excluded from the data available."

        

       I also included a summary of my post above, for those who want a shorter version.

27718. Tom Dayton at 09:43 AM on 3 August 2015
       Climate models are even more accurate than you thought
       

       Is there a CMIP-5 model output dataset that is narrowly targeted at layers of troposphere above “surface,” against which the RSS and UAH variety of indices properly should be compared?

27719. Phil at 08:22 AM on 3 August 2015
       Climate models are even more accurate than you thought
       

       A question this post and Kevin's comment @3 prompts is this.

       GCM's provide global temperature projections, whereas the observed records have limited coverage. Kevin has used infilling, using the kriging technique to make the observations more global (As it were). But presumably the reverse could also be done - namely taking the subset of grid cell output from the models that match the coverage of a given temperature record (say HadCrut4). 

       This would obviously only be of use in making model-observation comparisons, not for future projections, but I wonder whether anyone has tried this, or conversely whether there is a flaw in my idea?

27720. bozzza at 01:49 AM on 3 August 2015
       2015 SkS Weekly News Roundup #31C
       

       ..this, in turn, will lead to a convergence in the form of nomenclature, will it not!??!

27721. PhilippeChantreau at 01:26 AM on 3 August 2015
       2015 SkS Weekly News Roundup #31C
       

       Jenna, if Tom Curtis' answer is too much detail for your friends, you can ask them why they're so intent on denying the existence of a consensus, while at same time arguing that science is not done "by consensus." Most deniers have forgotten by now that it was originally their myth that the science was ambiguous. As Tom points out above, the consensus really is a convergence of research results in published papers. There is no doubt as to where the weight of the evidence is pointing

27722. Tom Curtis at 15:42 PM on 2 August 2015
       2015 SkS Weekly News Roundup #31C
       

       jenna @2, the claim echoes those made by Fabius Maximus, and echoed by Joanne Codling three days ago.  They relate to the release of additional data from Verhenger et al (2014).  (Note, the PDF document is a data release, not a new paper - contrary to the misrepresentation by Codling.)

       A couple of things are worth knowing about the data.

       First, the authors invited responses from a number of groups chosen for their having authored scientific papers on climate change plus a small group invited because they had signed "... public statements disapproving of mainstream climate science".  That group represented just 2.4% of invitees, but 4.7% of respondents.  We are told that "about half of [the respondents only invited because of public political statements against climate science] only published in the gray literature on climate change"; ie, that they are not climate scientists at all.  Further, even for the "about half" who are climate scientists, it is unlikely that that many of them would have been invited from a random sample of climate scientists.  Indeed, we know that they would not because there is not a 50% overlap between the "unconvinced" and those invited on their merits.

       Fairly obviously, because the rest of the respondents were invited based on their names appearing of authors on climate science related papers in the scientific literature, that introduces another bias into the group.  Those who have published fewer papers are less likely to have been invited.  Ergo, even ignoring the deliberately introduced bias in favour of the "unconvinced", the sample is also biased in favour of frequent publishers.  Ergo the the sample does not represent a random sample of climate scientists, and therefore it is impossible to infer from the sample frequencies the frequencies of particular beliefs among climate scientists in general.  The results are merely indicative, and when we look at patterns among subsamples, informative.

       Second, the survey explicity asked about the respondents breadth of knowledge in climate science.  That is very important because "climate science" is a multidisciplenary subject with a very complex field.  As a result, many climate scientists are very expert in a particular issue relating to climate science without therefore being expert in all, or even many aspects of climate science.  In fact, among respondents only 34% indicated that their "general knowledge of physical climate science" was "broad" or "quite broad", with another 31% indicating that their knowledge was only "slightly broad", or that it was "not broad" at all (Question 8a).

       A similar question was asked about depth of knowledge of even one aspect of climate science ("one or more aspects of physical climate science"), with only 38% indicating it was "very deep" or "quite deep" on even one aspect, while 35% indicated it was only "slightly deep", or "not deep" on even one aspect of climate science.  The low level of stated depth of knowledge would be a function of two factors.  One is the level of comparison.  Scientists would compare their depth of knowledge to the acknowledged experts in the specialist field (aspect), so that even "slightly deep" knowledge may well represent at least an undergraduate level of understanding of the topic.  Further, because climate science is multidisciplenary, coauthors of climate sciense papers may be authors because of their specialist knowledge in a related field, but not in how it applies to climate science.  A paper on dendroclimatology (determing past climates from tree rings) may include as an author an expert in tree rings who has not studied any aspect of climate science beyond the effects of temperature and precipitation on treering density and width.

       Given these stated limits on the knowledge of climate science by the respondents, it is absurd to argue (as Joanna Codling does) that:

       "Fabius Maximus suggests we exclude the “I don’t knows” which brings up the number to 47%. Since these are “climate scientists” I don’t see why those responses should be excluded. An expert saying “I don’t know” on the certainty question is an emphatic disagreement with the IPCC 95% certainty."

       Climate scientist is not the same as "expert on attribution of temperature increases", the latter being a distinct and very small subset of the former.  Therefore when a climate scientist says about an attribution question that "I don't know", it is safe to assume that is because attribution is not their area of expertise, and that they should not be included among the experts in that area.

       So, where does the 43% come from?  Essentially, Maximus takes the percentage of respondents who agreed that 50% or more of "global warming since the mid-twentieth century can be attributed to human induced changes in atmospheric greenhouse gas (GHG) concentrations" (question 1a), which is 65.9%.  He multiplied that by the percentage that agreed that the certainty was "extremely likely" or "virtually certain" (65.2%), thereby obtaining a percentage that agreed with the IPCC AR5 both with respect to the attribution level and certainty (43%).

       So, even on face value, the claim becomes that only 43% of a non-representative group of climate scientists and skeptics without necessarilly having detailed knowledge on attribution agree with experts in attribution who have spent more than a year in a detailed review of all the relevant data on attribution both on amount and certainty.  To that, I think, the appropriate response is, "so what".  Without a detailed study of attribution, climate scientists have no independent knowledge of the level of attribution, let alone the certainty of the attribution.  Do Maximus and Codling realy expect detailed study of (for example) ENSO, will magically confer the knowledge of not just the best estimate of the attribution percentage, but also the certainty of the estimate?  Perhaps they do.  Codling at least certainly seems to believe it is possible to make detailed and exact attribution statements by studying just the Sun - and may well carry a similar magical view of science across to other areas.  But just because they live in a fantasy land is no reason for us to take them seriously.

       Of course, many, including many who don't have an investment in "anything but CO2" being the cause of recent warming may find such a reponse unsatisfying.  For them it may be necessary to examine the numbers.

       If we do that, the first thing to notice is that the IPCC AR5 says that:

       "More than half of the observed increase in global mean surface temperature (GMST) from 1951 to 2010 is very likely due to the observed anthropogenic increase in greenhouse gas (GHG) concentrations."

       But that:

       "It is extremely likely that human activities caused more than
       half of the observed increase in GMST from 1951 to 2010."

       (My emphasis in both quotes)

       As the survey question relates to the effect of greenhouse gases, it is the first statement, not the second that is the relevant comparison.  That being the case, if you want to compare those who agree with both the attribution level and the certainty, it is the certainty of the first statement (not the second) that should be used.  That immediately lifts the percentage to 65.9% (attribution) * 89.3% (certainty), or 59%.  Puting it simply, Maximus fudged the issue by using an incorrect comparison.  Without that fudge he could not have claimed a minority of scientists agreed with the IPCC.

       The second thing to notice is that the percentage increases significantly if we eliminate the non-climate scientists and the overrepresented "skeptics" from the sample.  This is a necessary step if we want to interpret the result as anything meaningful with relation to climate scientists.

       As it happens, 14 (15.9%) of those "unconvinced" respondents agreed with the concensus that more than 50% of recent warming is due to changes in GHG concentration.  Removing those 14 from those agreeing on attribution, and the other 74 "unconvinced" from those 'disagreeing' lifts the attribution percentage to 68.4%, and hence the total agreeing on both attribution and certainty is lifted to 61%.

       The third thing is that not only the "I don't knows" but also the "others" should be excluded from the response.  The first because (as note above) "climate scientist" is not the same as "expert on attribution" so that when they say that they do not know, that response should be taken as a statement of personal ignorance, not (as Maximus and Codling would have it) just a variant formulation of "it is unknown".  That is, a statement of personal ignorance is not a conclusion that the experts are wrong in stating that they know something.  

       The "other" category needs to be excluded because it is logically incoherent.  The available responses allowed you to respond that there was "no warming", or that the cause of the warming was "unknown".  It also allowed you to respond that GHG was responsible for "less than 0%" of the warming.  That is, it covered all logical bases.  For something to be "other" you have to agree that warming was greater than zero (to exclude the "no warming response").  You further have to agree that the answer to the attribution question is known (to exclude the "unknown" response), known by you (to exclude the "I don't know" response, and that GHG caused neither less than nor more than 0% of the warming (to exclude all other possible responses).  Having done that, you are at least a sixth of the way to dining at Milliways.  Put simply, the "other" responses are inchorent and therefore should be excluded.

       Excluding these two cagegories excludes 222 responses from all responses, and 7 responses from the "unconvinced".  That means excluding them raises the attribution level to 74%, and the 66%.

       To summarize, if we did a valid comparison with the IPCC AR5, and did not pad out the survey numbers with known "skeptics" and by including explicity statements of ignorance and incoherent results to pad out the denominator, the proportion we would obtain would be, not 43%, but 66% agreeing on attribution and certainty, and 74% agreeing on attribution.  That is, Maximus has deflated the agreement to fit his narrative by 35% at minimum.  (Given that the survey is of climate scientists in general, not of researchers into attribution in particular, I would say he has deflated it by 58%.

       Having said that, I would still not call 74%, let alone 66% a consensus.  It is a supermajority.  This should bring some caution in the over interpretation of studies like Cook et al (2013), which showed a 97% concensus in published literature - not among climate scientists.  That however, has been evident for a while.  What is known, however, is that the more expert climate scientists are on the topic, the more likely it is that climate scientists will agree with the IPCC consensus.  The same is shown with Verheggen et al, with 84.5% of respondents having published 30 papers or more (and exlcuding those who express personal ignorance or have an incoherent response) agree with the IPCC on attribution.  Only 8.5% think GHG concentrations are reponsible for less than 50% of warming, or think there has been no warming; and only 7% think the answer unknown.  (Percentages calculated by pixel count, and are only accurate withing approx 0.5%).  No doubt the percentage would be even greater among climate scientists with experience in attribution studies. 

27723. Rob Honeycutt at 15:29 PM on 2 August 2015
       2015 SkS Weekly News Roundup #31C
       

       Jenna... I believe that comes from JoNova. I would suggest locating the original research she's quoting and see if it agrees with what she's saying.

27724. rkrolph at 14:16 PM on 2 August 2015
       2015 SkS Weekly News Roundup #31C
       

       jenna,

       You don't need to keep debunking something that has already been debunked.  See #4 of "most used climate myths" listed on this site. If you really want to, just ask them to provide the evidence for their claim and then it will be easy to show that it is nonsense.

27725. jenna at 11:07 AM on 2 August 2015
       2015 SkS Weekly News Roundup #31C
       

       Please, can someone from this website write a debunking of the latest denier scam saying "the 97% Consensus is now 43%" ?

       That's all my denialist friends have been talking about lately, it's driving me nuts! 

27726. wili at 09:35 AM on 2 August 2015
       2015 SkS Weekly News Roundup #31C
       

       "Earth now halfway to UN global warming limit"

       Glad someone who could publish had the same idea I did a couple weeks ago here.

27727. bwilson4web at 03:53 AM on 2 August 2015
       Water vapor in the stratosphere stopped global warming
       

       Hi,

       I was surprised to see this chestnut arise again in a PriusChat forum. Thanks to the search function here I quickly found this article that identified 'Solomon 2010' as the source. Google quickly snatched a copy of the paper and quickly revealed one of their sources, the Microwave Limb Sounder (MLS) is still operating and the data publicly available.

       It turns out, MLS shows the 'Solomon 2010' claim that humidity in the stratosphere going down did not remain the case. At least one subsequent paper which can be identified at the MLS as well as the site itself says stratospheric humidity is rising. It looks like the 'Solomon 2010' paper was premature.

       Bob Wilson, Huntsville, AL

27728. Rob Honeycutt at 01:55 AM on 2 August 2015
       Climate models are even more accurate than you thought
       

       knaugle...  I think pretty much every climate scientist everywhere would say that. 

27729. knaugle at 00:26 AM on 2 August 2015
       Climate models are even more accurate than you thought
       

       Who is the New Zealand scientist SS SkS quoted who said something like:

       "Even without the computer models, we would still be very concerned about the effects of warming"? 

        

       Moderator Response:

       [JH] Please adhere to our protocol in your future posts. 

27730. BC at 22:23 PM on 1 August 2015
       Climate models are even more accurate than you thought
       

       It's all adding up which is good - measurements matching models gives more confidence to all. I have two comments though. Firstly after seeing these adjustments I can't help thinking that they are pretty obvious - why hasn't someone done this ages ago. Congratulations to those who did do it though.

       Secondly on the Denial 101 course there was reference to a paper which analysed where on the planet the main differences between the models and measurements were occurring over the last period of years. The answer was something like North East America and North/central Asia during winter were the main time and place where the measurements were cooler than the models. The paper concluded by saying something like that this needed to be further investigated/understood to improve modelling. So there's a small niggle that the recent paper discussed in this post has legitimately bought the models closer to measurements, but not by addressing where the main difference is occurring?

27731. Kevin C at 16:54 PM on 1 August 2015
       Climate models are even more accurate than you thought
       

       Rolf: Whether the first author of the paper is a climate scientist or a critic of climate scientists is a question on which some climate scientists are equivocal.

       We didn't adjust the observations. We simply tried to use the same methods to get a temperature from the models which are used to get the temperature of the real world.

27732. denisaf at 13:23 PM on 1 August 2015
       10 Things We Learnt From Reddit About Understanding Climate Change
       

       Climate change and ocean acidification have been instigated primarily by fossil fuel usage. That is the stark reality. Decisions that society makes about the future operation of the technological systems of industrialized civilization can do no more than slow down climate change and ocean acidification. The greatest need is for society at all levels to understand that. With that understanding, measures could be implemented to deal with the problems stemming from this response of nature to the unintended consequnces of using fossil fuels to supply energy.

27733. bozzza at 12:34 PM on 1 August 2015
       Climate pledge puts China on course to peak emissions as early as 2027
       

       @4, don't worry about the 'trouble-makers': they are allowed to exist only under condition.

       Markets are meant to be robust, thus the existence of said 'trouble-makers' is for mutual benefit and when it isn't they have nothing to hide behind. Saying all that means they won't disappear of course: it's called synergy! Thus things take time is all.

27734. bozzza at 12:22 PM on 1 August 2015
       Climate models are even more accurate than you thought
       

       Scientific method relies on critique: as does any method, else it would cease to be called method.

27735. Rolf Jander at 11:26 AM on 1 August 2015
       Climate models are even more accurate than you thought
       

       Unfortunatly a study by climate scientists that says their models are good will only be met with derision. Any talk of adjusting data, no matter how nessesary will be called "fudging the data"

27736. r.pauli at 06:19 AM on 1 August 2015
       10 Things We Learnt From Reddit About Understanding Climate Change
       

       great post - be sure to read the comments at the Reddit link.   One disturbing comment:

       "–]Klaus_OberauerProfessor of Cognitive Psychology | University of Zurich 

       Actually, I don't think of the internet as a catalysator of social progress. There is social progress on many fronts, in particular in the direction of increasing tolerance and inclusiveness of society, but that trend has begun long before the internet (think of the civil rights movement in the 1960es, the fight for women's rights to vote going back to the early 20th century). The internet has the potential to make other people's suffering available easily to everyone, but it also involves the potential of ignoring everything that's inconvenient to a person because there is such a huge amount of information to choose from that everyone can live in a tailor-made information environment consisting only of convenient, self-confirming information (e.g., reading only those news sites that match one's ideology). Hard to say how these potentials pan out on balance."

27737. MA Rodger at 23:33 PM on 31 July 2015
       2015 Arctic melting season won't break records, but could wipe the 'recovery'
       

       CBDunkerson @9.

       As you say, the July figures will show all but the June figures are also quite telling. July usually gives the lowest PIOMAS anomaly (and July 2015 is but a few days wait away), but the big drops in the anomaly occur during May-June. This year that drop was a meaty 1,200 cu km but July 2015 remains 2,500 cu km behind July 2012 which just too much to catch up. So on that score, I cannot see 2015 Arctic SIV overtaking 2012. As of July 2015, PIOMAS SIV remains the 6th lowest on record but I would expect it to drop below 2014 into 5th spot by September.

27738. CBDunkerson at 21:49 PM on 31 July 2015
       2015 Arctic melting season won't break records, but could wipe the 'recovery'
       

       Tom, to clarify... I'm primarily looking at the ice volume record. Both extent and volume hit minimums in 2012, but in some years those have not been linked. Thus, while I agree that it is very unlikely the extent record will be broken this year, I am less certain about the volume record. If NRL is accurate then about half the multi-year ice has already been wiped out and the remaining half seems fairly exposed. That could lead to a steep drop in volume even while extent stays relatively 'high' due to widely spread chunks of thin broken up ice. It'll be easier to see how likely a volume minimum is once the PIOMAS results for July come out.

27739. michael sweet at 05:42 AM on 31 July 2015
       2015 SkS Weekly News Roundup #31B
       

       Tamino has a review of a paper by Cowtan et al 2015.  Cowtan et al find that the comparison between modeled temperature and measured temeprature increase has been done incorrectly in the past.  When properly corrected, 38% of the differrence between modeled and measured temeprature increase is eliminated.  Joining Cowtan are a group of stellar researchers.  The basis of their update is common sense once they point out the problem, although they say actually doing the comparison correctly took a lot of work.  This paper will be interesting to discuss.  The deniers will freak out at this conclusion.

27740. wili at 02:00 AM on 31 July 2015
       2015 SkS Weekly News Roundup #31B
       

       Nice coverage, as always. Just to continue my past record of volunteering your voluntary staff to do yet more work for free '-): There has been quite a lot of discussion in the papers and on blogs about the recent Hansen et al. paper on slr and related issues. Any chance of a synopsis or a collection of related articles and sources? If you want, I could get you started with a few...

       Moderator Response:

       [JH] Sorry, but i do not have the time to inventory articles about Hansen's draft paper. 

27741. Alexandre at 01:25 AM on 31 July 2015
       10 Things We Learnt From Reddit About Understanding Climate Change
       

       Great post. People always have more pressing concerns, and this diverts the needed attention from this huge, long term problem.

       The takeaway message for me here is keeping it simple and respectful. Inoculating the warning about denying propaganda sounds useful, too.

27742. Tom Curtis at 01:18 AM on 31 July 2015
       2015 Arctic melting season won't break records, but could wipe the 'recovery'
       

       CBDunkerson @7, here are the ARCUS sea ice extent predictions as of July:

       

       Only two lie below the 2012 record, while one matches that record.  Of those three, one (from Wadhams) is frankly absurd.  I suspect that the 5 million km^2 median prediction may be a bit conservative, but I would be surprised at values below 4 million km^2.  I think it would require near perfect melt conditions plus high winds for at least the next month to match the 2012 record, something I don't think at all probable.  If I were to make a prediction, I would split the difference between Gavin Cawley's statistical prediction and Wu and Grumbine's model based prediction, and call it at 4.65 km^2 

27743. CBDunkerson at 22:20 PM on 30 July 2015
       2015 Arctic melting season won't break records, but could wipe the 'recovery'
       

       I'm actually surprised by the "won't break records" call. Neven's probably right that we won't see a new record low this year, but that doesn't seem anything like a sure thing to me.

       Cryosphere Today is showing ice area only around 0.26 million sq km higher than for this point in 2012... and if anything, ice thickness maps seem to indicate that volume loss may have been even more pronounced. Indeed, the only remaining large mass of thick ice on the NRL map seems potentially vulnerable to getting wiped out.

27744. Tom Curtis at 20:41 PM on 30 July 2015
       2015 Arctic melting season won't break records, but could wipe the 'recovery'
       

       Bozza, here are the 100% values by year for MA Rodger's graph @5:

       

       So, 100% in 1983 equals 16.11 million km^2 (15.5 * 1.0395), while in 2015, 100% equals 14.37 million km^2   (15.5 * 0.927) 

27745. MA Rodger at 18:55 PM on 30 July 2015
       2015 Arctic melting season won't break records, but could wipe the 'recovery'
       

       bozzza @4.

       Do bear in mind that the 100% of Winter SIE being divvied up in this graphic has been shrinking through the decades. 2015 was 10% below the average at the start of the time period in this graphic.

       

27746. bozzza at 16:22 PM on 30 July 2015
       2015 Arctic melting season won't break records, but could wipe the 'recovery'
       

       ..are there any time-series graphs on multi-year ice? 

27747. bozzza at 16:20 PM on 30 July 2015
       2015 Arctic melting season won't break records, but could wipe the 'recovery'
       

       I don't like the idea of sine waves forming around the lower 2 standard deviations from the norm... but if multi-year ice is coming back I have to accept the fact.

27748. bozzza at 16:13 PM on 30 July 2015
       2015 SkS Weekly News Roundup #30B
       

       That peabody stock seems to have fallen in half at faster than regular intervals: i.e. faster than exponential!

27749. bjchip at 10:26 AM on 30 July 2015
       2015 Arctic melting season won't break records, but could wipe the 'recovery'
       

       One does have to also consider the amount of wood being turned into soot up there though.    Might see a strong second half.  

27750. Jim Hunt at 03:43 AM on 30 July 2015
       2015 Arctic melting season won't break records, but could wipe the 'recovery'
       

       The SkS magnifying glass on the University of Bremen concentration map suggests that there will be an "ice free" passage along the Northern Sea Route by now. Here's a video derived from the higher resolution AMSR2 imagery from the University of Hamburg that suggests that is indeed now the case:
       
       https://youtu.be/i4Z_pGre3oA
       
       

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