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Comments 13101 to 13150:

13101. JC16932 at 02:52 AM on 4 October 2018
       Venus doesn't have a runaway greenhouse effect
       

       The simulations of the greenhouse effect do not take into account the quantities of CO2, but it is essential. The greenhouse effect on Earth is essentially due to the atmospheric water whose variations range from 0.4 to 7% ! In addition nobody follows the evolution of the global humidity of the atmosphere. There is therefore a lack of data.

13102. Richard Bramhall at 02:24 AM on 4 October 2018
       It's methane
       

       MA Roger @45 Thank you. That's exactly what I wanted. I am in UK too and I did wonder about the methane harvesting possibility but my neck of the woods is Powys in Wales which has a pathetic county council and I doubted that their heads are in the right century. I could be maligning them. I'll check and get back to  you. 

13103. MA Rodger at 00:28 AM on 4 October 2018
       It's methane
       

       Richard Bramhall @44,

       The magic term you seek is "Global Warming Potential" (GWP) which is a measure of the resulting AGW caused by emissions of a gas by-weight relative to the warming caused by the same weight of CO2=1. As methane is less long-lived in the atmosphere, the GWP of methane depends on the length of your assessment period, the two period-lengths usually used being 20 years & 100 years. The EPA are presumably authorative enough for you and they are using the values from the IPCC AR5. These are GWP(100 yr) = 28 to36 and GWP(20 yr) = 84 to 87.

       I would add that while landfill does produce methane (being anaerobic) and garden composting CO2 (being aerobic), in my neck of the woods (UK) methane from landfill is being put to good use generating electricity although it can also be carted away and pre-processed before landfilling, (plans for such pre-processing being in hand for the tip over the hill from me). Thus collection of garden waste for landfill can be improving on the emissions from garden composting that waste as the renewable energy produced reduces the generation and thus emissions from fossil-fuelled power-stations.

13104. JC16932 at 22:29 PM on 3 October 2018
       Venus doesn't have a runaway greenhouse effect
       

       There is 4.72.10 ^ 20 Kg of CO2 in the atmosphere of Venus, this CO2 is responsible for 430 ° C of the greenhouse effect of the planet = 13870.15 W / m2.

       On Earth, there are 150 000 times less CO2 (3.128.10 ^ 15 Kg) than on Venus, which corresponds to an energy of 0.092 W / m2 (for the whole 400 ppm of the atm) that is to say Nothing at all !

       Moderator Response:

       [DB] It is well-understood by science that without the GHG effect the surface of the Earth would be some 33 C lower than at present.  And research has shown that without the stable backbone provided by CO2, the terrestrial temperature profile of the atmosphere would collapse in short order, dropping the surface temperature of the Earth by about that amount.

       What you have made is basically an argument from your personal incredulity, a logical fallacy.  Such do not cut it, here.  Please familiarize yourself with this venue's Comments Policy and comport future comments to comply with it.  Thanks!

13105. Richard Bramhall at 20:32 PM on 3 October 2018
       It's methane
       

       I found this page because I was looking for an authoritative answer to the question "Is methane a more effective driver of climate change than CO2 (as I have believed since 1980), and if so by how much?". I don't feel any wiser. It seems clear that the answer is "yes" but the "how much" lacks agreement. What's the latest best guess, or range of such?
       I want this because the municipal authority where I live plans to withdraw facilities for composting garden waste and replace them with kerbside collections which go to landfill. On the logic that organic waste in landfill generates methane, this plan seems insane and I want a reliable datum to say just how insane.

13106. scaddenp at 14:17 PM on 3 October 2018
       2018 SkS Weekly Climate Change & Global Warming News Roundup #39
       

       nigelj, we signal our political colours in many ways. Sadly i think published in Washington Post (or CNN) is enough of a red flag for GOP. (I think - I am not that up on US media). Criticising a person rather the policy is always a flag, especially a president - seems worse in US because a president has so more power than normal democracies. I dont think you would have much trouble thinking of clues you would use to identify someone political leanings. [ and on strictly NZ note - can you guess where Geoff Robinson's vote went? (miss him badly). A great example of strong questioning without any sign of bias ]

       Tribalism is ingrained in us but right wingers value loyalty and respect for authority much more than left wingers. (see Haidt for example fig 3).

13107. nigelj at 13:15 PM on 3 October 2018
       2018 SkS Weekly Climate Change & Global Warming News Roundup #39
       

       Scaddenp @22,

       I agree its not a good idea for people to identify their own political leanings on websites, because it creates an us and them mentailty and immediate distrust and hostility to the other sides views. I have no disagreement with the research you quote because it just doesn't surprise me in the least.

       I believe I have mentioned my own political leanings once or twice on this website, but it is really because of the nature of an article, and in a discussion one on one with OPOF I think (from memory) but as a general rule I dont self identify my leanings on websites.

       In fact one reason I like this website is its moderated, so you don't get the pointless political points scoring competitions on other media websites of the nature where pages and pages are devoted to "you stupid lying liberal / conservative / fill in with whatever group you want." Man it gets boring fast.

       Having said that, immediately one even politely criticises for example the GOP you are tending to hold up a flag saying you are probably a liberal, or conservatives will jump to the conclusion that you are. However I suppose theres nothing that can be done about that, other than minimise the possibility by trying to make fair minded, rational and make objective criticisms. Humour always helps diffuse tribalism.

       It's interesting because theres certainly an opposing point of view that says just the opposte that people should speak their minds and both self identify, and be harshly and rudely critical - play Trump at his own game. However Im sceptical of this. While a certain level of harshness is often appropriate, I dont like vicious personal attacks, and theres an old saying "dont get down in the mud and wrestle with a pig because the pig might like it".

       But I go along with what OPOF has said that sometimes points have to be made, even if they upset some people or you are not liked as a result. Imho there has to be a forum for open discussion on tough political issues as they relate to the climate issue, provided its polite and I see nothing rude by anyone on this page. It's important to analyse group dynamics and peoples motives whether selfish or altruistic and discuss such things. I hear what you say that putting a value jusgement on it creates a problem and alienates people. Making people feel guilty doesn't always work, yet some things just seem wrong and ultimately I feel they have to be pointed out.

       Its a sad truth that right now the GOP is being obstructive on policies that would make a difference on climate change - although this is not a personal criticism because some research I have seen suggests Republicans make as many efforts at reducing their carbon footprints in their personal lives as democrats. But they oppose the science and mitigation at federal level in many cases and more than the Democrats. This is anobservable fact, the very stuff of science so it would be anti scientific to ignore it. Its also an observable fact that some people are greedy and some aren't - for good or bad.

       But anyway I'm sure you would see my point.

       I don't like tribalism by the way. It may be part of the "human condition" but it's destructive, and I have never strongly identified with groups and I go my own way. It should not be encouraged or it will lead to civil war.

13108. John Hartz at 13:09 PM on 3 October 2018
       New study finds incredibly high carbon pollution costs – especially for the US and India
       

       Recommended supplemental reading: 

       Fighting climate change is too expensive because destroying the planet is cost-free, Opinion by Tom Toles, Washington Post, Oct 1, 2018

13109. scaddenp at 13:04 PM on 3 October 2018
       2018 SkS Weekly Climate Change & Global Warming News Roundup #39
       

       OPOF - I havent read the works you mention but I am happy to concede them true in every particular. What I am getting at is effectively the difference between science and science communication, or more generally, truth and apprehension of truth. You cant convince people of the value of your "good reason" if you present in a way that guaranteed to stop them listening to you.

       Carrying on about the planet being destroyed by people with selfish, shallow motives is tub-thumping. Selfishness and altruism are essential parts of our makeup. I struggle to think of anyone I have met who didnt think they were essentially "good" and with altruist impulses even when I see them as mostly grasping and self-serving.

       There is some doubt as whether we can even discover our motives - humans are first class at post-hoc rationalization. Have a quick look at Moral Foundation Theory and note the heavy experimental backing. Telling people to think differently will not work.

       You dont have to compromise your beliefs to respect the beliefs and world view of other when you are talking to them. If you dont show that respect, then they will not listen. You might feek good and justified but you wont change a thing. Which is actually important to you?

13110. One Planet Only Forever at 11:47 AM on 3 October 2018
       2018 SkS Weekly Climate Change & Global Warming News Roundup #39
       

       scaddenp,

       I will present my comment at 20 in a different way.

       I am currently reading "The Enigma of Reason" by Hugo Mercier and Dan Sperber. I am only a short way into the book but have come across their reference to Daniel Kahneman's "Three Cognitive Systems". The three are Perception, Intuition and Reasoning.

       People who are avoiding improving their awareness and understanding can be understood to have developed Perceptions about what is to their benefit, that they Intuitively defend (intuition is that gut feel about something), and they will avoid or evade having to develop and present good substantiated reason for what they intuitively prefer to believe regarding their perceptions. This behaviour is strongly related to selfishness, and will not be very strongly related to altruism.

       The overarching good reason, what all good reasons would be a sub-set of, is helping others - particularly helping to develop a sustainable better future for all of humanity, and certainly not wanting to harm the future of humanity in any way. Let me know if that is what you refer to as my Tub-thumping. And if so, I am open to hearing a presentation of a more rational overarching purpose for a human. btw, I have no interest in compromising that awareness and understanding for anything less than the good reasons I understand are the basis for that being the overarching good reason basis for determining the acceptability of human actions, just as climate scientists should not be interested in compromising their awareness and reasoned understanding to accommodate the perceptions, intuitions and preferences of people who have self-interests that would have to be corrected if they accepted the awareness and reasoned understanding of climate science and its implications regarding the future of humanity.

       I appreciate that that may disappoint some people. But anyone who is that determined to not improve their awareness and understanding about how they can be helpful rather than harmful is sort of a lost cause, in need of external monitoring and governance until they change their mind.

       Looking at it the other way, all evidence indicates that compromising the understanding of what needs to be corrected has not worked out well for the future of humanity. And I know, that reality is a Reasoning Challenge for some people who would prefer to maintain their Intuitive preferences for favourable personal Perceptions. But playing along with harmful delusions is not really helpful, even if it gets people to Like you.

       Good Leadership is hard work, especially when Harmful Leadership can easily be more popular.

13111. scaddenp at 11:02 AM on 3 October 2018
       2018 SkS Weekly Climate Change & Global Warming News Roundup #39
       

       nigelj - I dont think there is anything wrong with criticism/critique (quite the reverse) but I think there are good and bad ways to do it. Critique of policy is vital, normal/expected. How much notice someone takes of criticism however depends on who is making criticism. In USA, I would guess that Dems and GOP pretty much ignore anything said by the other party. Criticism by non-partisan experts is another thing altogether. If you immediately show your colours with some value-based statement, then the criticism will be ignored by the other colour. Probably wont read past that identifier even. I think you have to focus on the detail from a strictly non-partisan perspective, avoid value-based judgements and respect all moral foundations.

13112. scaddenp at 10:42 AM on 3 October 2018
       2018 SkS Weekly Climate Change & Global Warming News Roundup #39
       

       OPOF - firstly I think you are seriously mischaracterizing the opposition and imputing motives that are no more important to right-wingers than left. I think you should try having some respectful conversations with right-wingers to see what I mean.

       Secondly, I think your tub-thumping (for want of better word) is hopelessly ineffective, alienating and at best preaching to the choir. At worst you are alienating even people that agree with your beliefs. That is what the research shows. Do you actually want people to change how they behave or are you just content to feel self-rightous and rant at them? Everything you say might be true, but it is no help if the person you are trying to talk to switches off without reading/hearing it.

13113. Daniel Bailey at 09:45 AM on 3 October 2018
       New research shows the world’s ice is doing something not seen before
       

       "As readers of this site should know, _Artic_ sea ice melting will NOT 'cause sea levels to rise.'"

       Readers of this site usually read the entire article for clarity, and most read the linked sources given.  Further, the quote you object to doesn't refer to sea ice, a point that the author then makes clear pains to clarify.

13114. One Planet Only Forever at 08:33 AM on 3 October 2018
       2018 SkS Weekly Climate Change & Global Warming News Roundup #39
       

       Many people appear to evade and avoid improving their awareness and understanding, especially avoiding understanding that the primary objective of living as a human is to help others, particularly to help (not harm) the development of a sustainable better future for all of humanity.

       People wanting to hide from the challenge of improved awareness and understanding of climate science (because of the corrcetions of what has developed that are required), can be expected to seek places where they will hear comforting claims like 'things will be better if everyone is freer from being restricted by government', a claim that side-steps the reality that less 'government of the people by the people for the people' actions/restrictions can only produce decent results if more of the people, particularly more of the wealthier people, are self-governing responsibly to help develop a sustainable better future for everyone.

       And many of those who seek that type of limited awareness do not suffer from cognitive dissonance. They are consistently selfish in their seemingly dissonant claims about wanting to help others yet trying to defend unhelpful/harmful actions. They can be understood to like to claim that they support some aspect of the Sustainable Development Goals (because they understand how appealing a claim about wanting to be helpful can be), while resisting the understanding that all of the Sustainable Development Goals need to be achieved, and climate action is a key Goal (the less climate impact created and the more that the more fortunate help the less fortunate, the easier it is to achieve almost all of the other goals).

       The people who isolate themselves in such ways probably like to excuse their behaviour as natural human actions based on the Prisoner's Dilemma (how humans who deserve penalty can be expected to act if they have no opportunity to interact and collectively rationalize what they are doing). And their behaviour can be understood to be attempts to get away with committing Social Dilemma style unacceptable actions (hoping to get away with understandably unacceptable behaviour - but liking to claim that the Social Dilemma only applies to examples of less fortunate people unacceptably trying to get away with something). And they probably sense that their actions are contributing to a massive Tragedy of the Commons, but changing their mind based on that sense of awareness would be inconsistent with their developed selfish interests - better for them to evade and avoid improving that awareness and understanding - better for them to evade and avoid having to rationally justify what they prefer to believe.

       Bottom line: I do not agree with compromising improved awareness and understanding just to 'get along with' someone who is trying to evade or avoid the challenge of improving their awareness and understanding. But I accept that some hard to justify beliefs are benign or may even be helpful. As an example: I support efforts to help people who want smaller government to understand that the required first step is getting everyone to self-govern more helpfully, reducing the need for external governance to limit or correct what is going on. Another example: The result of a person having a spiritual belief can range from helpful through harmful. Almost all religions encourage their members to try to be helpful to all others and be accepting of diversity. Yet many religious people choose to restrict how they will help, who they will help, and what limit of diversity they will accept (desiring an excuse for their otherwise unacceptable interests any way they can get away with). Some of them have even become so unhelpful in their selfish pursuits that they have created the absurd excuse that their religion teaches them that Their God has created This Planet in a way that humans cannot harm - their ultimate refutation of any aspect of climate science (or environmental science) that is inconsistent with their selfish interests.

13115. celsaesser at 06:50 AM on 3 October 2018
       New research shows the world’s ice is doing something not seen before
       

       The article states:

       "The Arctic is warming much faster than other parts of the planet and the ice there is showing the signs of rapid warming. This fact has serious consequences. First, melting ice can cause sea levels to rise and inundate coastal areas"

       This is NOT a helpful statement and is, in fact, providing a (valid) target to deniers.

       As readers of this site should know, _Artic_ sea ice melting will NOT 'cause sea levels to rise.' Including the statement only serves to (a) misinform the ignorant, and (b) offer fodder for those who will (not 'might') claim that SkepticalScience is 'fake'.

       There is no need to make false statements; the facts speak for themselves.

       Moderator Response:

       [JH] A readers of this site well know, it is always best to carefully read an entire article before commenting on it. You obviously did no do so. Therefore your critique of Abraham's article has no foundation and is entirely unwarranted.

       BTW, the use of "all caps" is prohibited by the SkS Comments Policy.

13116. John S at 04:37 AM on 3 October 2018
       New study finds incredibly high carbon pollution costs – especially for the US and India
       

       This is interesting, but economics is not the only measure of value.  I would say the value of stopping global warming is priceless.  Therefore, the correct price to put on carbon is that which does all it can to help stop global warming, which is to 100% eliminate GHG emissions from combustion of fossil fuels.  We can discover that price by continually increasing the carbon price until there are no more such emissions, say a minimum increase of $10/tonne/year adjusted for inflation and if it turns out that is not working fast enough, rachet it up to a new minimum.  Since the price is expected to go very high, it cannot be a tax, it must be revenue neutral.  This is close to the proposal known as Carbon Fee and Dividend recommended by James Hansen and advocated by Citizens Climate Lobby (CCL).  The Climate Leadership Council (CLC) backed by Exxon, Shell, BP, Total, GM, Exelon and a bevy of conservatives in the US also say they advocate Carbon Fee and Dividend but they want to roll back all regulations, whereas there are some perfectly good regulations like for corporate average fuel efficienty standards and methane inspection and fixing and possibly others that should stay and CLC, not to be confused with CCL, are wishy washy on price increases above 40$/ton (could that be because while it knocks out coal as a competitor it possibly leaves oil in still a not bad position for transportation and natural gas for building heating, industry and power generation - or am I being cynical?) a

13117. nigelj at 18:27 PM on 2 October 2018
       2018 SkS Weekly Climate Change & Global Warming News Roundup #39
       

       Scaddenp @16 you dont like people criticising those on the right (or left), because it alienates them, and I agree there is a risk of this.However the article above actually criticises Republicans as does the latest article on the social cost of carbon, in a restrained sort of way. Its therefore not surprising that people follow this lead. The articles also simply pretty much just state whats happening.

       Should such articles not even be written simply because it might upset some people? Wouldn't that be precious or artificial somehow?

       However I dont think strident or nasty political rants are helpful. It needs a certain sensitivity and some restraint.

13118. imacca at 16:34 PM on 2 October 2018
       2018 SkS Weekly Climate Change & Global Warming News Roundup #39
       

       Ahh...sorry, should maybe have read the posting policy better.  :(

       Moderator Response:

       [JH] The comment threads to both the Weekly News Roundups and the Weekly News Digests are considered to be "open" threads. The Op-ed that you posted a link to is acceptable as long as everyone knows that it is an op-ed. In fact, I will likely post a link to the op-ed you flagged on the SkS FB page in the near future.

13119. imacca at 16:33 PM on 2 October 2018
       2018 SkS Weekly Climate Change & Global Warming News Roundup #39
       

       Hi guys.  Found this on the Guardian today.  By Grog, who has a good grasp of data and numbers.  Political, but worth a read in the context of where Australian emmisions policy is........or isn't.  :(

       https://www.theguardian.com/business/grogonomics/2018/oct/01/australias-emissions-data-would-shame-the-coalition-if-such-a-thing-were-possible

13120. scaddenp at 06:43 AM on 2 October 2018
       2018 SkS Weekly Climate Change & Global Warming News Roundup #39
       

       John, I agree about different mission but if you have someone with a Republican identity coming here to look at the science and then discovers the masses of GOP bashing and demonizing of the Right, then that paper suggests they are unlikely to even read the articles in a way that might educate them. By contrast, visiting a denier site, that while full of garbage, reassures the reader by being full of liberal-bashing. When someone is evaluating conflicting statements without the means (say a college physics degree) to accurately analyze them, then it comes down to what sources do you trust. Sources friendly to your tribal identity win every time.

       What intrigued me, was that RepublicEn not only sort the same aim, but also promoted a solution (Fee and dividend) which I think is most popular in the science community. What is different is the way it is being sold. They appeal directly to right wing sensibilities.

13121. nigelj at 06:25 AM on 2 October 2018
       New study reconciles a dispute about how fast global warming will happen
       

       MAR @27, thanks for the research link.  The economist.com did quite a good overview of this methane issue as below. If you dont subscribe to this pay to read publication, you can get a few article for free each months like this one on methane if you register with the website.  

       https://www.economist.com/science-and-technology/2018/04/28/scientists-struggle-to-explain-a-worrying-rise-in-atmospheric-methane

13122. nigelj at 06:05 AM on 2 October 2018
       2018 SkS Weekly Climate Change & Global Warming Digest #39
       

       Yes progress is agonizingly slow and its turning into an epic disaster. I wonder if part of the problem is people are just not scared enough yet. For example we mostly talk about warming of possibly 4 degrees by 2100 and I suggest its easy to be complacent about this, it doesn't sound so much. Of course it is huge in physical terms with dire consequences , but I'm talking about the general psychological perception the public might have.

       Now the other day I was looking at a chart of IPCC emissions scenarios that happened to have a worst case scenario of 12 degrees by year 2300 approx. if we continue to burn fossil fuels in a worst case business as usual scenario and burning fossil fuels is something various politicians are quite happy to see happen. I do wish to be accurate that this dire scenario is at the outer bounds of error bars etc, but even 9 degrees would be absolutely dire.

       These projections get a little buried in iPCC reports, and the media focus is on the year 2100, but the year 2300 is not that far into the future in terms of human history and our grandchildren or their children etcetera,  and obviously 12  degrees would be horrendous, an existential threat of collosal scale. These projections need more publicity in the general media so the public are firmly aware of them. Its not sensible to be only focussing on 2100. It is of course important as its in some of our lifetimes and certainly our childrens, but it can create a false sense of security to think only about this century.

       Now I know sacremongering can have the reverse effect that it intends, and care is needed in what the climate community says to the public. I don't think it helps when people like Guy McPherson proclaim that humanity could be extinct within decades (although he makes many good points) because its based on very thin evidence and insults peoples intelligence,  while the IPCC has excellent work buried in its reports that is based on pretty good evidence like its temperature projections.

13123. nigelj at 05:39 AM on 2 October 2018
       2018 SkS Weekly Climate Change & Global Warming News Roundup #39
       

       William @13, what you say is true and people need to be aware of this. It could wipe out your lifes savings. However I think by climate change falling disproportionately on the poor I think they meant that  poor people in asia will be hit very hard and it will be a question of survival in many cases, especially in low lying countries, while the home owner in florida who loses his house will never starve (strong economy, social security etc) 

13124. nigelj at 05:30 AM on 2 October 2018
       2018 SkS Weekly Climate Change & Global Warming News Roundup #39
       

       OPOF @11, I came across this article a few days ago about politicians trying to weaken statements in the summary for policy makers in the recent IPCC report. It gives some specifics on what they wanted changed and left out. Its of course extremely concerning that they would even attempt to do this. 

13125. william5331 at 05:15 AM on 2 October 2018
       2018 SkS Weekly Climate Change & Global Warming News Roundup #39
       

       An article this week describes how the effects of climate change will be felt disproportionately by the poor of the world.  There is some truth in this but if you are living in a tin shack or a bamboo, thatched hut, it is not all that hard to upstakes and move upslope or out of the flood plain.  Granted, there may already be someone there that is not too happy with you intruding on his space.  Look, however at a rich Florida retiree who, before he retired lived up north and contributed to climate change.  He has his life savings tied up in his very ellegant brick and mortar house right on the beach.  What does he do when the insurance companies, who know what is coming, refused to renew his flood insurance and he finds his lounge is more often than not a swimming pool.  Even if the insurance companies did renew his insurance, the cost of the completel flooding of coastal city after coastal city will simply be too much for them.  After all, the premiums people paid went to give obscene bonuses to their top brass, not to invest in stocks that would preserve and grow their reserves.  They will falter and default. The higher you are the harder you fall.

13126. MA Rodger at 00:51 AM on 2 October 2018
       New study reconciles a dispute about how fast global warming will happen
       

       nigelj @25,

       The Schurr et al link @24 works okay for me. However ResearchGate provide a PDF download and also ReadCube (which only provide full sight of the first page) provide a link to the Supplimentary Information.

       The NASA page you link to @26 presents well the findings of the likes of Schaefer et al (2016). This perhaps fits with the idea that the tropical wetlands will be more of a future problem regarding methane emissions than will the Arctic emissions, as found by Comyn-Platt et al (2018) who calculated the Arctic methane emissions would be 25% to 30% that of the wetlands emissions.

13127. One Planet Only Forever at 00:39 AM on 2 October 2018
       2018 SkS Weekly Climate Change & Global Warming Digest #39
       

       Upon further consideration, I would change the last sentence in my comments opening para to be: "Trying to maintain or increase the already incorrectly over-developed perceptions of superiority relative to others just makes the future consequences worse."

13128. One Planet Only Forever at 00:36 AM on 2 October 2018
       2018 SkS Weekly Climate Change & Global Warming Digest #39
       

       This is developing to become a man-made disaster of epic proportions.

       The economic over-development in the incorrect direction, economies substantially based on the benefits of the global burning of fossil fuels, is a bubble. It is undeniably unsustainable and undeniably more harmful the longer it is allowed to go uncorrected. Trying to increase the already incorrectly over-developed perceptions of superiority relative to others just makes the future consequences worse.

       The future consequences of the lack of correction of unsustainable and harmful economic development are two things: more significant and more rapid required corrections of the incorrectly developed economic activities, and more costs of 'trying to clean up' the harmful results that grew to a larger magnitude due to the lack of earlier correction. The lack of previous action to correct the incorrect direction of development has already created some harms that may be impossible to clean up (to fully undo).

       The current generation is facing a more significant economic bubble correction and more clean-up than it would have had to if previous generations of global leadership had more responsibly started correcting what had developed. And the situation is made worse by every year of continued successful resistance among the global 'undeserving winners of perceptions of wealth and superiority relative to others' to the undeniable required corrections of what has developed.

       Some richer people deserve to become poorer, particularly the ones who have pursued more personal wealth from fossil fuel burning through the past 30 years. It is as simple as that. That has happened to some of the coal barons. It needs to happen to oil barons and natural gas barons.

       The loss of undeserved perceptions of wealth happens all the time with economic corrections. But what can also be seen to happen is that many of the richer people do not become as poor as they deserve to be. Instead, already less fortunate people suffer more because the wealthier ones have power to protect their undeserved perceptions of superiority relative to others.

       Big changes are coming. Hopefully global leadership can get the correct changes to happen. The less successful they are at making correct change, the worse things will become. And things have already become very bad.

13129. John Hartz at 23:12 PM on 1 October 2018
       2018 SkS Weekly Climate Change & Global Warming News Roundup #39
       

       @scaddenp #4: This website, SkepticalScience.com, has a completely different mission and audience than does the RepublicEn website. 

13130. One Planet Only Forever at 14:00 PM on 1 October 2018
       2018 SkS Weekly Climate Change & Global Warming News Roundup #39
       

       This recent BBC article, "IPCC: Climate scientists consider 'life changing' report", further exposes the unacceptability of the developments in nations like the USA, Australia and Saudi Arabia (and Canada is not mentioned, but its leadership efforts to expand the rate of export of oil sands bitumen mean it should have been named along with the others, along with Russia).

       The article also explains the process of writing the IPCC reports. That process includes government-minders pushing for the wording to be the least opposed to the their interests, with scientists trying to ensure that the weakened wording is still reasonably consistent with the science.

       That pressure by political self-interest to compromise the scientific understanding of the public interest is most powerful from many of the supposedly most advanced nations. And it is likely due to the reality of how undeserving the winners of the games played actually are, how many wealthier and more powerful people do not really deserve their developed perceptions of superiority relative to others.

13131. One Planet Only Forever at 13:35 PM on 1 October 2018
       2018 SkS Weekly Climate Change & Global Warming News Roundup #39
       

       nigelj,

       Getting a carbon tax implemented and reasonably rapidly increasing it will almost certainly require the type of correction I am taking about, the type of correction you indicate is unlikely to sustainably develop, but can and must sustainably be developed.

       The Social Dilemma claim may be an excuse for a 'lack of interest in interacting rationally based on the objective of developing a better collective result'.

       The Prisoner's Dilemma only exposes the way people can behave when there is no back-and-forth interaction based on reasoning to develop the best common action plan (and the reality is that both participants know that they deserve to be penalized - I get back to this point later regarding how some people are Uniting).

       The Social Dilemma discussion presents similar cases, where a person is able to avoid or evade others becoming aware of the reality of their behaviour (aspects of the behaviour of those Uniting greedier and less tolerant people).

       And the Tragedy of the Commons is the ability to do something that others should be concerned about stopping, but lack an awareness and lack the ability to identify and act against the appropriate sub-set of the population to stop the unacceptable actions.

       They all involve a lack of ability to be, or interest in being, helpful to developing a sustainable better future for humanity. They involve limited awareness or limited understanding of what is going on. And their prevalence in a population can be understood to be the result of the socioeconomic-political system (games and refereeing) that they develop in.

       The problem is the system. And a sustainable solution will not be developed without effectively addressing and correcting the error in the system.

       Carbon Taxes in Canada appear to be hit-and-miss. They depend on what political party wins power. And the evidence appears to be that leadership that implements them reduces their chances of staying in power (one possible exception is BC, but future incremental increases of carbon taxes in BC may lead to a loss of the leadership that does that).

       Those opposed to a carbon tax willingly join the United greedier and intolerant who collectively oppose climate action as well as opposing the other corrections that the understanding of the Sustainable Development Goals point out are required for humanity to have a future.

       The Uniting of the greedier and less tolerant is an interesting phenomenon. It is a common sense development, meaning that it is understandable how people with a diversity of selfish interests can be expected to realize the importance of Uniting to support each other's understandably unacceptable interests. It indicates that selfish people can act collectively, which would appear to be a contradiction of the claims made about human nature based on the Prisoner's Dilemma and the Social Dilemma. And the collective actions of those selfish people can powerfully limit efforts to correct cases of Tragedy of the Commons.

       What is tragic is the failure of those who have been tempted to join the United greedy and less tolerant to realize the unacceptability of what they support (which includes their personal motive for joining that group). And one of the potentially most tragic results is the devolution of a society past a tipping point, away from responsible governing of actions in the society as more people are tempted to join a United group of greedier and less tolerant people (money in politics is not a problem, money in the wrong hands is the problem, and the more invisible those wrong hands are the worse the result).

       The pursuers of smaller government can often be seen to join those types of groups, or believe they are staying in a responsible rational Conservative group. But they fail to realize that government actions can only be reduced when responsible self-governing has been effectively and sustainably increased in the society. They fail to realize that supporting the United collective of greedier and less tolerant people makes it harder to reduce the requirement for Responsible Government (government of the people by the people for the people encouraging better behaviour and refereeing and acting to effectively penalize less acceptable behaviour that is unjustifiably trying to win, or has actually gotten away with unjustified winning).

13132. scaddenp at 12:54 PM on 1 October 2018
       2018 SkS Weekly Climate Change & Global Warming News Roundup #39
       

       Well I am absolutely no angel either here but my son did his masters on this sort of stuff and it was a bit of wake up call. Tamino, who is somewhat abrasive at best of times has also tried to tone it down. Locally in NZ, protesters screaming "dirty dairying" arent going to win over any farmers whereas people and groups etc willing to work beside farmers are being effective. Assuming people with different views are selfish morons is not a good way to make progress.

13133. nigelj at 12:06 PM on 1 October 2018
       2018 SkS Weekly Climate Change & Global Warming News Roundup #39
       

       Scaddenp says "Looks to me like a "Republicans for Climate Action" site could be a more effective communication tool in the US site than politically neutral sites like this where all too many commentators identify as liberals and demonize the right."

       Scaddenp gives some of us a bit of a telling off and fair enough it makes sense to avoid adding to the tribalism by discussing ones own politics and talking too much about left and right, although I think regular contributors here are pretty restrained compared to my experience of other websites.

       The article was actually political, so its very hard to not make a political response of some form, although clearly we should avoid demonising other tribes of people, or engage in extended cynical and mocking rants ( tempting though I find this ha ha).

       But I think Jacinda Adern handles Trump and related matters rather well by focussing on her beliefs and agenda, rather than personally attacking Trump or his agenda. Scaddenp would appreciate this. John Key did much the same to his credit.

13134. nigelj at 11:41 AM on 1 October 2018
       2018 SkS Weekly Climate Change & Global Warming News Roundup #39
       

       John Hartz  posts "Climate change is real and we believe it's our duty and our opportunity to reduce the risks. But to make a difference, we have to fight climate change with free enterprise instead of ineffective subsidies and regulations."

       The writer would need to elaborate, but one assumes he would be referring to the efforts of people like Elon Musk, and the general power of competition to drive innovation, all laudable things. But sadly not everyone acts in these ways.

       The "ineffective subsidies and regulation" can be fairly interpreteed to mean either no regulation, or no regulation that I dont like. But it would be good if people acted responsibly without the need for regulations imposed by governments as the writer, and OPOF alluded to,  but such a world may be implausible because of the  well known and fascinating social dilemmas discussed in this article.   At the very least we might need a carbon tax in some form.

       Moderator Response:

       [JH] Point of clarification: I did not write the quotes you have attributed to me. What you are quoting is from the About US statement posted on the RepublicEn website. I reposted that statement in my comment #5.

13135. barry1487 at 10:35 AM on 1 October 2018
       Climate Bet for Charity, 2017 update
       

       You won the side bet in June last year, Rob, And you predicted it all the way back in 2013, when you first posted on this bet:

       I would also note that on his chart his Y-axis tops out at 0.25°C. He's probably going to have to shift that up to 0.3°C or higher before all is said and done.

       KT has added 0.1 to the top of his Y axis so far.

       

13136. scaddenp at 09:01 AM on 1 October 2018
       GHG emission mitigation solutions - a challenge for the Right?
       

       I am heartened to find some rightwingers taking this challenge up in the US See www.republicEn.org.

13137. scaddenp at 09:00 AM on 1 October 2018
       2018 SkS Weekly Climate Change & Global Warming News Roundup #39
       

       Excellent - I did look but didnt find anything. Depressingly small at moment, but I seriously hope they grow like hell. Their viewpoint is what I was trying to find when I wrote "GHG emission mitigation solutions - a challenge for the Right?"

13138. John Hartz at 06:54 AM on 1 October 2018
       2018 SkS Weekly Climate Change & Global Warming News Roundup #39
       

       scaddenp: Your wish has already been filled. Check out http://www.republicen.org/. 

       The About Us page of its website states

       We are 5981 Americans educating the country about free-enterprise solutions to climate change.

       Members of republicEn are conservatives, libertarians, and pragmatists of diverse political opinion. We stand together because we believe in American free enterprise. We believe that with a true level playing field, free enterprise can deliver the innovation to solve climate change. But America's climate policy needs to change. Change requires that conservative leaders step-up and lead.

       Climate change is real and we believe it's our duty and our opportunity to reduce the risks. But to make a difference, we have to fight climate change with free enterprise instead of ineffective subsidies and regulations.

       Moderator Response:

       [PS] Fixed link

13139. scaddenp at 06:26 AM on 1 October 2018
       2018 SkS Weekly Climate Change & Global Warming News Roundup #39
       

       A wholly expected scientific outcome http://www.pnas.org/content/115/39/9714. If a participant in a discussion identifies you as the opposite party, then they fail to learn anything from you. Looks to me like a "Republicans for Climate Action" site could be a more effective communication tool in the US site than politically neutral sites like this where all too many commentators identify as liberals and demonize the right.

13140. nigelj at 06:06 AM on 1 October 2018
       New study reconciles a dispute about how fast global warming will happen
       

       MAR @24, this review is interesting related to the recent increase in atmospheric methane levels. It is almost like a curved ball in that the permafrost is not turning out to be the problem at least in the short term, and instead the tropics are. Expect more curved balls from the climate.

13141. nigelj at 05:52 AM on 1 October 2018
       New study reconciles a dispute about how fast global warming will happen
       

       MA Rodger @22, the Schuur link didnt work, but I found a copy of the abstract. I think what we have going on is positive feedbacks with melting permafrost, counter balanced by negative feedbacks where carbon is captured by increased plant growth, but this in turn reaches limiting factors because warming can decrease photosynthesis like a cascade of feedbacks.  Its for these sorts of reasons why I intuitively feel that climate change will be bad, but not quite as off the scale as the usual suspects over at RC think, because basically they dont think. However I'm no biologist either, so this is speculation on my part.

       But people are growing vegetables in the tundra in this article  (as it thaws) which certainly reinforces your comments.

       Yet we are left with the methane problem, although currently the global increase in atmospheric methane appears related to the tropics, with no evident spike in the tundra regions.

       I think theres an emotive component to this, where theres clearly a problem with permafrost that I believe is hundreds of metres deep in places, and so theres huge potential for a powerful positive feedback that is truly scary, we should be scared,  but we have to also calmly ask how would this actually play out? What is the likely rate of release? The evidence appears to suggest its quite slow, but the periods of hothouse earth suggest an awful lot could melt eventually and become self reinforcing.

13142. william5331 at 05:12 AM on 1 October 2018
       2018 SkS Weekly Climate Change & Global Warming News Roundup #39
       

       It makes one sputter with frustration. Humanity has achieved so very much with our technology with a beginning understanding of the true deep roots of biology, our electronics, ability to talk with anyone anywhere in the world, our understanding of physics and on and on. And these venal, stupid, self serving politicians are going to wreck it all for a handful of silver and a feeling of power. Any reasonably bright year 12 student could tell them exactly what we have to be doing to avoid this catastrophe and they refuse to listen. The key to the whole sorry mess is the old adage WHO PAYS THE PIPER CALLS THE TUNE. As long as vested interests finance our politicians, the politicians will do their bidding and we will pay the price. We think we are getting some sort of a bargain by having someone else finance election campaigns instead of the money coming from our taxes but the cost to us is orders of magnitude larger than if we footed the bill. Only if we finance politicians will there be any chance of making headway on the many solutions we must put in place to survive as a society and perhaps as a species on into the future.

13143. MA Rodger at 04:13 AM on 1 October 2018
       New study reconciles a dispute about how fast global warming will happen
       

       nigelj @22,

       The particular point I was considering with my comment @21 "the spread of plant growth as high latitude lands warm"  was less about bigger forests and more about the convertion of the frozen permafrost land into biologically productive land.

       The permafrost is seen as being a serious problem under a warming climate because it contains large carbon stocks.  Hugelius et al (2014) put it as 300Gt(C) in shallow soils and 800Gt(C) in deep soils (and that a downward revision on previous estimates, athough you can then find Shelef et al (2017) who argue for a possible upward revision, up to 600Gt(C) on top again). By comparison, the Amazon carbon stocks (also at risk of being destabalised with AGW) are considered to be much smaller - 200Gt(C). While not all this permafrost carbon will be melted-out and then enter the atmosphere, the large numbers are a worry.

       Yet there is work that shows only a small percentage of the frozen carbon entering the atmosphere. Schuur et al (2009) shows much of the carbon released from frozen soils is matched by carbon captured by those same soils. Thus Schuur et al speculate that only 9% to 13% of the thawed soil's carbon will add to global CO2 emissions.

       Of course, the possibility that significant proportions of that carbon appears as CH4 would add to the warming potential of the released carbon.

13144. One Planet Only Forever at 03:46 AM on 1 October 2018
       2018 SkS Weekly Climate Change & Global Warming News Roundup #39
       

       What is happening in the USA is one of the most powerful case-study examples of the downward spiral of unacceptable results that can develop when less deserving people Win competitions for popularity and profitability.

       Undeserved perceptions of prosperity and of superiority relative to others have developed because of the incorrect belief that competition for perceptions of superiority relative to others will naturally develop good results and deserving winners. The truth is that without all members of a society pursuing improved awareness and understanding with the objective of helping to sustainably improve the future for everyone, not harming any others (including and especially not harming future generations), the behaviour of the people who will not responsibly helpfully self-govern their development and behaviour need to be governed by responsible helpful collective government.

       Many Americans may indicate that they support action on climate change. But they have other 'more important to them' interests and desires that are understandably contrary to the achievement of one or more of Sustainable Development Goals which include the Paris Agreement (and those desires were also contrary to the achievement of one or more of the Millennium Development Goals which included the Kyoto Accord). They will support the Group that promises to deliver their most important personal desires, even if that group will oppose the Climate Action they indicate that they want (because that group is led by the collective of wealthy and powerful people who are opposed to one or more of the corrections required to achieve a sustainable better future for humanity).

       What has been happening around the world can be understood to be undeserved winning by harmful people in nations at all levels of development, including (and likely to a more damaging degree) in the supposedly most advanced nations.

       For many decades, Leaders (Business and Political) around the world have understood the future consequences of the lack of actions to rapidly correct unsustainable and harmful developments and directions of development based on the constantly improving awareness and understanding of what is really going on. They fight to maintain the status-quo, or get back to the good old days when they had more freedom to get away with personally benefiting from less acceptable behaviour.

       The problem that needs to be corrected is the ability of the understandably more harmful pursuers of Winning to be more profitable and more popular than their competition. Getting away with unsustainable or more harmful actions will make delivering what people desire cheaper, make it easier to 'give people what they want' (note that it costs wealthy people very little to support socially harmful actions in order to get less tolerant people to support their greedy desires, hence the Uniting of greedy people with less tolerant people on the Right of the political spectrum).

       People can easily be tempted to prefer and excuse cheaper quicker easier ways to get something they have been encouraged to develop a desire for. And people can be easily tempted to desire things that they would 'personally enjoy or be more comfortable with' but do not 'need'. And those people will seek ways to ignore and excuse any understanding of the unacceptability of what they desire.

       People can tragically be easily tempted to fight for harmful and unsustainable perceptions of personal benefit, perceptions of superiority relative to others. That includes fighting for beliefs about their superiority relative to other life rather than properly understanding that Darwin's observation of Survival of the Fittest means that humans only have a future by acting in ways that Fit sustainably into a robust diversity of other life on this or any other amazing planet.

       The behaviour of leaders and the examples they set needs to be understood to be very powerful. Any political or business leader who claims that leaders only 'do what the people want' and should be rewarded if they do that, is probably also actively participating in developing unacceptable desires and popular support for unsustainable and harmful actions. They understand that they can be bigger winners if they can get away with being secretive and misleading through deliberate appeals to the primal selfishness of people in the general population. They can get people to desire things by triggering attitudes like greed and intolerance. They can develop powerful desires for actions that impede efforts the development of a sustainable improving future for humanity.

       Those types of pursuers of winning are the real problem. Helping to improve the awareness and understanding of the general population and helping achieve the corrections of what has developed so that humanity will have an improving sustainable future is contrary to their short-term selfish interest.

       The UN has been working on improving awareness and understanding of the required corrections of development since its inception (created after the failure of the League of Nations to achieve that objective). And those unacceptable pursuers of personal benefit have been fighting against those United Global Efforts any way they can get away with (with less success than they had fighting against the League of Nations pursuit of the objective - but still massively harmfully successfully at fighting against being effectively corrected).

       The reality is that the supposedly more developed nations have developed many seriously incorrect perceptions of prosperity and opportunity, and have seriously incorrect and unsustainable perceptions of superiority relative to others (because they have developed the unsustainable and harmful desires to be perceived to be superior relative to others).

       Political leaders in the USA, and all other nations, need to tell their population that many among them have developed unsustainable and damaging delusions as a result of the tragically flawed results of competitions for popularity and profitability in socioeconomic-political systems that increase, rather than reduce, the development of unsustainable and harmful beliefs and desires (desires and beliefs that are contrary to the constantly improving awareness and understanding of what is really going on and the corrections required for humanity to have a sustainable and improving future).

       What politician or business leader is going to 'succeed more and be more rewarded' if they tell the general population that many of the wealthiest and most powerful among them do not deserve their developed perceptions of wealth and power? Those undeserving wealthy powerful people are United globally to collectively fight to defend their undeserved perceptions of superiority relative to others. And they are masters of tempting the general population to be greedier and less tolerant, tempting them to like the less deserving among the winners and dislike the more deserving among the winners.

       The world 'needs' smaller government everywhere, which can only happen by developing populations that 'need' smaller government to develop sustainable improvements of human activity. Smaller government does not develop the type of population that can sustainably develop with smaller government oversight of the development. Increasing the proportion of the population that self-governs responsibly is required before government oversight and correction of development can be reduced.

       The winners/leaders need to be the examples of the self-governing behaviour that the rest of the population should aspire to. Effective means of correcting the unsustainable and harmful behaviour of winners/leaders is what is required. The politics of popularity and profitability can develop damaging inertia in a population that makes it more difficult to correct understandably incorrect developments. It is highly unlikely that incorrectly developed activities will be corrected without first correcting the incorrect understandings of what is really going on and the unacceptability and unsustainability of developed perceptions of prosperity and superiority.

13145. nigelj at 13:32 PM on 30 September 2018
       2018 SkS Weekly Climate Change & Global Warming News Roundup #39
       

       So Mr Trump, is climate change a hoax or is it leading to 7 degrees of warming? The mixed messages are astounding. It seems at best that one arm of America's government does not know what another arm is saying, or perhaps they do and its something similar to Orwells book 1984's and his ministry of double speak. Either way America is becoming a huge global pain in the neck.

       "The world would have to make deep cuts in carbon emissions to avoid this drastic warming, the analysis states. And that “would require substantial increases in technology innovation and adoption compared to today’s levels and would require the economy and the vehicle fleet to move away from the use of fossil fuels, which is not currently technologically feasible or economically feasible.”

       Have these people not observed electric cars, wind farms, studies showing negative emissions technology works etcetera ? What alternative universe do they live in?

       By not economically feasible they appear to mean it will "cost us more" but this ignores the costs of climate change on future generations, and studies show some extra money spent now will have substantial savings long term. Plenty of studies show that wind and solar power is alreadly cost competitive with traditional generation anyway ( refer to the  Lazard analysis) and the costs of electric cars are looking attractive, so the governments transport study looks like its "gone off the rails".

13146. nigelj at 10:27 AM on 30 September 2018
       New study reconciles a dispute about how fast global warming will happen
       

       MARodger @21, just a couple more comments on your comments.

       "The second issue is probably that "8 degrees" issue. If we do over-run the Paris limits, how bad can it get? The "3.4°C warming by 2100" mentioned in the OP, the level of AGW suggested by GCMs if the current commitments made by nations are fulfilled and no more. My own view is that we don't want to be going anywhere as awful as a +3.4°C world, but if we did provide that level of forcing to achieve it, how much extra could we expect? How strong do feedbacks become if we over-run Paris?"

       No I agree we dont want to get anywhere near 3.4 degrees. I don't know how strong feedbacks would become precisely, but I would think feedbacks are non linear in nature, but I havent seen a graph of how it would go. Melting permafrost reinforcing levels of atmospheric CO2 sounds rather like a run away effect like an oscillating electrical circuit, but I think it still takes time for soils (and ice) to melt even under heavy warming. Everything I have read suggests sea level rise 10 - 20 metres will take well over 2 centuries but other things may not - like abrupt shifts in global weather patterns for example and they look like they will be chnages for the worse.

       But reagrdless of all this, warming feedbacks levels could still destabilse eastern antarctica, and this could lead to sea level rise of about 2 metres per century even possibly this century, and to me this is the thing that is particularly worrying because of the rate of change. And such an elevation in temperatures could possibly cause a rapid and sudden change in atmposheric circulation on decadal to century length time frames, from what I have read.

       Even at our current 1 degree and 400 ppm of CO2 we appear commited to pliocene conditions of 3 degrees ultimately and about 10 metres of sea level rise (sort of a partial hothouse) but is something humanity coulod adapt to without massive pain. Imho anything more than 2 degrees is unthinkable in terms of scale and pain even if it takes many centuries to unfold. 

       I do see quite a lot of doomery coming, but I refuse to be a cynical pessimist, because that can be pointless. I think theres still much humanity could do to greatly reduce all these various dire possibilities. 

       Somebody said when in doubt or arguing about stuff, go back and look at the basic data. The stuff we are really sure about. The basic paleo climate data says that if we don't meet Paris goals, a serious hothouse earth is quite probable, and I think we can be reasonably sure at least some elements of it will be felt over the next couple of centuries, and  right now global temperatures in the GISS and Hadcrut datasets are tracking quite close to model estimates. These are huge flashing red lights, to my way of thinking.

13147. nigelj at 10:16 AM on 30 September 2018
       New study reconciles a dispute about how fast global warming will happen
       

       MA Rodger @21

       Thank's for the research links. I have read both and they are mighty interesting reading, although a lot to absorb, and I agree they leave some things unclear, and I think they leave questions unanswered as to how fast a hothouse earth might happen, other than a vague note about possibly a couple of centuries, but it's still a genuinely alarming statement. So is the 12 degrees in your IPCC emissions profiles table if we just go on burning fossil fuels.

       I do wish Americans would use celsius. Its very confusing using fahrenheit.

       "Firstly, how good is that 0.5°C estimate of additional warming at +2°C? "

       I assume you are suggesting forests spreading northwards would stabilise soils and absorb CO2. Interesting thought, and its not clear to me if they considered this. However the CO2 is plantfood effect is supposed to saturate fairly quickly or cancel out, because warming also affects photosynthesis and other soil processes and it intuitively seems to me that the march of forests northwards would tend to lag behind areas of thawing permafrost, but the question would be how much. They didn't really say. But it was apparently not enough to stop the earth entering past houshouse conditions assuming there were substantial areas of permafrost soils, so perhaps their 0.5 degree estimate is not far off the reality.

       The map in the research suggests total melt of permafrost is not locked in until about 5 degrees, which gives some hope because its this sort of CO2 feedback and consequent warming which really will spin us towards a hothouse earth in terms of temperature and thus horrendously extreme weather, although according to the study total ice melt will be locked in well before we hit 5 degrees. Hope in the sense that we could avoid the worst of the permafrost issue if we reduced emissions promtly to Paris time goals.

13148. MA Rodger at 19:24 PM on 29 September 2018
       New study reconciles a dispute about how fast global warming will happen
       

       nigelj @20,

       Chucking a few more words into that "gap", the "Study here" you link to (Note the "3.6 degrees" is Fahrenheit) is based on Steffen et al (2018) which I think is doing some good work but perhaps is not presenting a scientific message or presenitng it as clearly as it should. The actual paper itself spends too long in systems-analytical mode and so you have to delve into the Supporting Information to find quantifiable findings. If you add up the numbers in Table S2, it presents a potential additional 0.5°C of warming in a +2°C warmed world by 2100 resulting from all the extras not included in the GCMs. That 'additional' figure would presumably be bigger if it was assessed for 2200.

       I see two issues here. Firstly, how good is that 0.5°C estimate of additional warming at +2°C? Half of the 0.5°C is made up of melting permafrost emissions which helps simplify the analysis a bit. There has been over the last year a few papers suggesting that it is a +1.5°C that will trigger the bulk of the +2°C permafrost feedback. Mind, I do think these studies concentration on emissions which is just one side of the story. With all this thawing, there is also the spread of plant growth as high latitude lands warm. Steffen et al would do well if it prompted scientific discussion of the size of natural feedbacks under the sorts of warming humanity is hoping to keep to.

       The second issue is probably that "8 degrees" issue. If we do over-run the Paris limits, how bad can it get? The "3.4°C warming by 2100" mentioned in the OP, the level of AGW suggested by GCMs if the current commitments made by nations are fulfilled and no more. My own view is that we don't want to be going anywhere as awful as a +3.4°C world, but if we did provide that level of forcing to achieve it, how much extra could we expect? How strong do feedbacks become if we over-run Paris?

13149. nigelj at 06:54 AM on 29 September 2018
       New study reconciles a dispute about how fast global warming will happen
       

       MAR @18, just filling in a gap in my own comments: "(Indeed, so too does your "about 8 degrees before things stabilise.") Study here.

13150. scaddenp at 07:59 AM on 28 September 2018
       It's methane
       

       mondosinistro - I have further responded on the topic indicated by the moderator.

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