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(new talk at the bottom)

some book I've read / Further Support

i think that the human race is not ment to exist on this planet. There is a very likely theory that the earth is in an ice age as we speak. The earth is not supposed to have polar iced caps, and humans are not ment to be living. the book i read is entitled 'Ice Age'.

I've actually herd this theroy too, durring an envirothon, an enviroment based science event for high school/ college students. The scientist educating us on this was pretty credable, and had some really good evidence, I think this theroy needs to be further explored and if reasonable brought into the Global Warming article.

Huh? Yes, we are, technically speaking, in an interglacial period of the current ice age, and have been for some 1000s of years. It is unknown how long the current interglacial would last without human intervention - current opinion is "probably much longer". Whether the earth is "supposed to have polar ice caps" depends, apparently, on a combination of orbital parameters and arrangement of continental plates. None of this has to do with the current anthropogenic global warming. We are currently modifying the environment in a way that heats up the earth much faster than any known natural process. --Stephan Schulz 22:29, 26 February 2006 (UTC)

section 'Climate Models',is misleading

No one should be surprised, that the people that write climate-model programs, tend to stick together in claiming climate-models actualy mean something. What is presented here, is totally one-sided. Climate models are essentialy curve fitting routines; with the coefficients being calculated by computer, to best fit past data points. In many cases, these coefficients have no physical meaning, they are simply numbers needed to get things to match. People familiar with math, know that an infinite number of functions can be generated to fit any arbitrary set of data. That means, you can generate a function that matches past data, but 'predicts' any future number the progammer desires. My suspicion is, the supposed concensus that models predict a 2 - 5 degree C increase in 100 years, is a consequence of --> if a modeller writes a program that predicts something wildly different that the concensus, --> he doesn't present that model at confernces. Any 'concensus', is no more meaningful that the direction of a buffalo stampede, most of the buffalo tend to do the same thing. Comments welcome.--CorvetteZ51 01:10, 2 February 2006 (UTC)

You are wrong. If all that is needed is a curve-fitting, you can use a standard algorithm and generate a polynomial of the desired degree (see the disuccsion at Talk:Global warming/extreme weather extrapolation graph). Climate models do indeed try to model the physics, i.e. they do not try to fit an arbitrary function. Yes, parameter fitting is required, but that is a very normal thing. Models are typically optimized on some part of the climate record, and then evaluated against the remainder. The model is considered useful only if a decent fit is achieved on this holdout set. As for your allegation: Scientist love finding unexpected answers. That is what gives you new publications. Nobody is publishing about the comparative speed of falling feathers and bullets in a vaccuum anymore.--Stephan Schulz 07:53, 2 February 2006 (UTC)

Has anyone ever performed a "history match" on these computer models? I was interested in finding out if anyone actually has run the numerical models (I am assuming they are numerical "cell by cell" 2D or 3D models?) in reverse to see if they fit with historical data collected over the last 100 or 150 years. Just a question from a skeptic. --Smithsmith 04:21, 3 February 2006 (UTC)

They do compare the models with historical data, but I don't know if they do it on a cell-level or just a worldwide level. Presumably some of the historical data goes into the model, so it's not quite like "running it backwards". Here's an example of the model performance over the past 150 years, running with natural forcings, or anthropogenic forcings, or both: bikeable (talk) 05:24, 3 February 2006 (UTC)

Thanks, Bikeable. I appreciate it. --Smithsmith 01:03, 4 February 2006 (UTC)

SSmiths comments show that he needs to do an awful lot of background reading. You can't run GCMs in reverse. Try global climate model for some stuff about how they work. Try the IPCC TAR SPM for fit-to-history (I think its fig 4). William M. Connolley 09:54, 3 February 2006 (UTC).

Yes, Mr. Connolley, you are correct. That is why I asked the question.--Smithsmith 01:08, 4 February 2006 (UTC)

CorvetteZ51, science is not politics. The consesus on global warming was reached in a different way than the consensus that Saddam had stockpilies of WMD. :) Count Iblis 13:47, 3 February 2006 (UTC)

Something missing

"...have suggested that irradiance changes over pre-industrial are less..."

...over pre-industrial what? Levels, I presume, but I leave it to you. Daniel Collins 02:45, 3 February 2006 (UTC)

I'd propose to revise the sentance to:

Since the TAR, various studies (Lean et al., 2002, Wang et al., 2005) have suggested that changes in irradiance since pre-industrial times are less by a factor of 3-4 than in the reconstructions used in the TAR (e.g. Hoyt and Schatten, 1993, Lean, 2000.)

However, I can only access the GRL paper from work, so can somone who has read it check that my revision actually correspends to the paper (or I'll do this on Monday).--NHSavage 09:34, 4 February 2006 (UTC)

You're right. YOu can throw in Foster, 2004 and Foukal et al., 2004 if you like, too :-) William M. Connolley 11:39, 4 February 2006 (UTC).

Glacier Mass Balance

Summary information on alpine glacial mass balance is available through the National Snow and Ice Data Center (http://nsidc.org/sotc/glacier_balance.html). A recent review by Dyurgerov and Meier (http://instaar.colorado.edu/other/download/OP58_dyurgerov_meier.pdf) shows that alpine glaciers in all regions (with the exception of Europe) show a cumulative negative mass balance over the interval 1960 to 2004 (see Figure 4 in the publication). Note that within Europe, there was a negative mass balance in the Alps and a positive mass balance in Scandinavia. There has been a recent edit by user Silverback that has modified materials related to this topic. As it stands, the reader would be left with the erroneous impression that alpine glacier retreat was only an early 20th century phenomena. The statement should be revised to reflect the reality on the ground. J. Hamilton 205.189.26.38 21:57, 3 February 2006 (UTC)

I revised the statement to reflect what was in the citation. WMC has reverted to an "an around the world" version that is not supported by the original referenced citation and is contradicted by the positive mass balance in Scandinavia evidence cited above. The paper cited in the article noted that most of the glacial retreat was in the first half of the 20th century. You should read the paper.--Silverback 04:55, 4 February 2006 (UTC)

I have no idea how you are reading Oerlemans and getting that most occured in the first half of the century. I'd give you that perhaps a little more did based on his work, but his figure 2 is fairly close to symmetric about 1950. However, I have removed the "increasingly rapid" since there does not seem to be any big change in the rate over the 20th century. I have also edited this section to incorporate some of the material found in the Dyurgerov and Meier paper cited above. Dragons flight 06:04, 4 February 2006 (UTC)

How about these quotes from the paper: "Glaciers witnessed a particularly strong warming at high northern latitudes in the first decades of the 20th century (fig. S4B)." and "From 1860 onward, most regions show a temperature increase. In the first half of the 20th century the temperature rise is notably similar for all regions: about 0.5 K in 40 years." Note that my statement was that most of the glacial retreat occurred in the first half of the 20th century. Look at figure 3b. Nearly all the rise came in the first half of the century, then there was a cooling, and then a recovery to the peak levels.--Silverback 14:47, 4 February 2006 (UTC)

Figure 3 is interpreted paleotemperature based on a non-uniform weighting of the glacier length changes. It is necessarily non-uniform because the temperature sensitivity of a given glacier depends on such factors as local angle of repose and mean annual accumulation. In talking about average glacier retreat (uniformly weighted) you should be refering to Figure 2. A discussion of glacier derived paleotemperature would more easily fit in glacier retreat or one of the temperature record articles, then the summary blurb here. Dragons flight 18:34, 4 February 2006 (UTC)

Someone obviously wanted glacier retreat in THIS article, it wasn't me. I see it in the same vein as trying to attribute specific huricanes to the part of GW attributed to human forcings.--Silverback 18:48, 4 February 2006 (UTC)

Seems fair enough, I've rv'd to DF's version. William M. Connolley 22:33, 3 February 2006 (UTC).

We aren't trying to be fair, just encyclopedic, hyperbole is questionable in an encyclopedia, even when justified. In this case, it hasn't even been justified.--Silverback 04:55, 4 February 2006 (UTC)

Singer and Avery?

Hi Silverback! Do you plan to do anything with the reference you added? It's not a peer-reviewed paper, but rather one of the typical reports coming out of conservative think-tanks. --Stephan Schulz 15:23, 4 February 2006 (UTC)

It is well footnoted by published authors, so it is as valid as a book reference. What I did with it was added before the reference was. I've read that they intend to expand it as a review paper or book, and are not claiming it is original research. --Silverback 15:58, 4 February 2006 (UTC)

I've removed the lot. Silverback, please stop pushing your POV into this . First of all, the Singer and Avery ref is *junk* (they can't even get the length of the ice age cycles right!). If you feel like defending it as valid, I'll rip it to shreds for you, but its barely worth the effort. Braun, of course, isn't junk: its just doesn't belong here. Why not add it into Dansgaard-Oeschger event, where it belongs? William M. Connolley 18:04, 4 February 2006 (UTC)

which Ice age cycles? You aren't referring to the rounding to 1500 are you?--Silverback 18:21, 4 February 2006 (UTC)

90kyr

WMC, I don't see a mention of of 90kyr ice age cycles, I see mention of cycles which include 90kyr ice ages, so the full cycle is obviously longer. I want to make sure this misreading of their statements does not clarify your issue before investigating further.--Silverback 09:57, 5 February 2006 (UTC)

Sb, this this is gobbledegook on your part. Can you not read: It has long been accepted that the Earth has experienced climate cycles, most notably the 90,000-year Ice Age cycles.. Now, go off to ice age and compare and contrast. William M. Connolley 10:42, 5 February 2006 (UTC).

No, the statement you cite is ambiguous, it could be interpreted either way, but later in the article their meaning is clear "The best-known of these is the Ice Age cycle, with 90,000-year Ice Ages interspersed with far shorter interglacial periods." Given their apparent meaning do you still accuse them of not having the length of ice age cycles right. Frankly I can't tell because they don't state the length of the cycle, they just appear to be identifying which cycle they are referring to.--Silverback 11:06, 5 February 2006 (UTC)

How does a solar explanation of the DO events, extending into the Holocene, not belong in the solar variation section?--Silverback 18:30, 4 February 2006 (UTC)

Its only a speculative mechanism for a solar trigger, not an explanation for the full range of the changes, so it has little relevance to current change. And if you want to say there has been a continuous range of D-O events with a 1,470 period in the holocence... you need to re-write the obs record first. Oh, and of course most people don't believe in a regular 1,470 year cycle for the D-O events, so don't believe in a solar connection anyway. William M. Connolley 18:52, 4 February 2006 (UTC).

...and the 1,470 solar cycle may be imaginary. Image:Carbon-14-10kyr-Hallstadtzeit_Cycles.png says so. William M. Connolley 18:56, 4 February 2006 (UTC).

There is so much cumulative evidence for the DO periodicity, including recognizing its influence in the historical record, that what was lacking was a plausible mechanism. The ability of this mechanism (the component cycles are already established in the literature) to allow the periodicity to be reproduced in a model is probably why Nature considered it significant. It makes sense. It could still be wrong, but then a lot in climate science could be, especially when it comes to modeling and attribution.--Silverback 19:54, 4 February 2006 (UTC)

Why are you making this up? "so much cumulative evidence" - nonsense. For D-O periodicity there is Rahmstorfs paper (which specifically points out the *absence* of a solar signal at the required period). Notice how... you aren't defneding Singers mistaken 90kyr claim; you have nothing to say about the *observed* solar periodicity being 2.3kyr if anything. Being a member of WP:HEC I shall wait till tomorrow to revert this Singer junk out again... William M. Connolley 20:04, 4 February 2006 (UTC).

Please assume good faith and refrain from personal attacks. (this comment by Silverback, it somehow got orphaned from the rest of the comment below)

Will you please avoid making up nonsense. There is lots of evidence for the D-O events, but for their *periodicity* is another matter entirely. William M. Connolley 10:42, 5 February 2006 (UTC)

The DO signal has been detected in both greenland and antartic cores and in Northern Atlantic modes. You should check the references in the Braun paper which you admit "isn't junk". Obviously, there can be several solar signals which periodically coincide and superimpose on each other. So a 2.3kyr period does not contradict a 1470 period. If you want to assemble and insert evidence of other periods, fine. I haven't tried to put Singer's "mistaken" 90kyr claim into the article. If I were to do so, I would consult his references, as far as I can tell, in the cited reference his is not claiming original results, just reviewing a body of evidence that he has assembled. Perhaps he has made a mistake, I know you have, but that is no reason to reject your information or his on an ad hominem basis.(this comment also by Silverback and somehow got orphaned.)

More nonsense. Go read the ice age article. Please stop flinging "ad hom" around as though it solved all your problems. William M. Connolley 10:42, 5 February 2006 (UTC).

Lets stick to the matter at hand, whether you "believe" in the 1470 periodicity or not, it is in the peer reviewed literature, and my text relies upon Singer and Avery for the information about what place in the cycle the earth currently is in.

The 1470 periodicity *for D-O* is in the literature, and you should be reading that, not trash like S+A. But the problem (as I've pointed out) is that the very paper that posits 1470 specifically states that there is no solar signal to explain it. Furthermore, there is *no* evidence for it in recent times, cos there are no D-O events in recent times, and as I've already pointed out, by ref to the wiki graph, is that whatever minor signal seems to exist in the millenial band, it looks like 2.3kyr. Also, S+A isn't a scholarly summation of the literature - its propaganda. Wiki should not be referenceing it as though it were scholarly. William M. Connolley 10:42, 5 February 2006 (UTC).

"trash", "most people", "junk", "hopeless", please stay away from incivility and ad hominem arguments. You have just been engaging in denial, despite the evidence in the literature of the cycle. The fact that the older original paper denied a solar cycle of that period is trumped by later literature and other evidence than the ice cores itself. The original author would have to deny the existance of the 210 and 87 year solar cycles, since the Braun paper based on their superposition. For other evidence, consider "Persistent Solar Influence on North Atlantic Climate During the Holocene" Gerard Bond, et al, in Science 7 December 2001: Vol. 294. no. 5549, pp. 2130 - 2136 where they state: "Surface winds and surface ocean hydrography in the subpolar North Atlantic appear to have been influenced by variations in solar output through the entire Holocene. The evidence comes from a close correlation between inferred changes in production rates of the cosmogenic nuclides carbon-14 and beryllium-10 and centennial to millennial time scale changes in proxies of drift ice measured in deep-sea sediment cores. A solar forcing mechanism therefore may underlie at least the Holocene segment of the North Atlantic's "1500-year" cycle." This is back in 2001 and I believe I have also read subsequent isotopic evidence extending the work.--Silverback 11:27, 5 February 2006 (UTC)

Do you have a basis for disputing their positioning of the current climate within that cycle.

What cycle? The non-exitent 1470 D-O cycle? William M. Connolley 10:42, 5 February 2006 (UTC)

I believe there is literature that associates the little ice age with that cycle, and Singer and Avery have positioned the cycle using that. I also relied upon their review for the 2 degree C amplitude of that cycle during the mild interglacials. Can you dispute that?--Silverback 09:38, 5 February 2006 (UTC)

Isn't all this far too much detail for this article? It should surely be under Solar_variation#Global_warming. To my way of thinking this should be concise summary of the more detailed information in that article. That section also needs a lot of work as it seems to lack any coherence. It is just a set of A said this and B said that. I would support WMC's reversion but suggest moving some of the debate to the solar forcing page.— Preceding unsigned comment added by NHSavage (talk • contribs)

Anon one, you probably should focus on the "effects" section of you are concerned about article detail/length. The solar information is central to balancing the key attribution evidence, there is no need to go into the speculative fear mongering on this page where we are trying to stick to the science. Frankly, I don't think the article is too detailed or too long, those are subjective judgements and I think the interested reader can handle this article, especially if we keep it well organized. So I am not going to oppose the effects section, just make sure it doesn't stray too far beyond the evidence.--Silverback 09:38, 5 February 2006 (UTC)

Of course it is a subjective judgement when the article is too detailed or long. That is why I phrased my original point as a question to people. However, I think it is very difficult and probably impossible to include a good summary when the original text is a mess. This discussion on the merits or otherwise of these papers belong over there not here. Get a good NPOV text there and then write the summary here.--NHSavage 12:18, 5 February 2006 (UTC)

This article is the original, the others are often neglected spinoffs, sometimes spunoff not by those who love the spunoff topic and want to elaborate the details, but by those who are territorial about this article and don't feel comfortable having some evidence in it. So no wonder they are lower in quality and receive less rigorous review. This is the article where the key evidence and questions should be explained.--Silverback 14:34, 5 February 2006 (UTC)

WMC, your original reasons for removal of this material has not proven correct, why do you persist in removing it when you can't justify it here?--Silverback 17:23, 5 February 2006 (UTC)

Silverback and 1RR/7

Silverback is limited to 1RR/7 Misplaced Pages:Requests_for_arbitration/Silverback#Remedies and has broken this: , . Silverback: can you please clearly and unambiguously promise to keep to your parole in future, or I'll report you. William M. Connolley 16:29, 5 February 2006 (UTC).

I haven't broken the 1RR/7 rule. I think you are misinterpreting it. It should be applied just like the 3RR rule, but with only 1R allowed. The evidence you cite is two independent reverts of independent material, that would not be counted under the 3RR rule intepretation. If you think I have misinterpreted this, perhaps we should go to the arbcom for clarification. I've been operating under this intepretation all along, and no one else has questioned it. So my interpretation is that I am under a 1 revert rule, differing from the 3RR rule only in number (1 instead of 3), and time period (7 days instead of 24hours). --Silverback 17:13, 5 February 2006 (UTC)

As far as I can tell, your interpretation of the parole is right, but your interpretation of WP:3RR is wrong. Quote: "Do not revert any single page in whole or in part more than three times in 24 hours". What you revert on a page is irrelevant. If you read WP:3RR, the interpretation is very clear. --Stephan Schulz 17:42, 5 February 2006 (UTC)

You most certainly have broken it, and your interpretation of the revert rule (alas, like your interpretation of so much climate science) is quite wrong. Note to others: Vsmith has blocked him, so Sb can't talk here: probably best to see ]. William M. Connolley 17:51, 5 February 2006 (UTC).

the realclimate.org link (no. 34)

The realclimate.org link no.34 is not working for me. Is anyone else having success with it? I get "Parse error: parse error, unexpected ':' in /usr/www/users/realc/wp-content/plugins/email-notification-v1.4.php on line 156"--Silverback 21:50, 5 February 2006 (UTC)

Works fine for me (Safari 2.03). They do mention a problem with email on the page, though. Try again, maybe you hit maintenance time.--Stephan Schulz 22:15, 5 February 2006 (UTC)

didn't work for me the first time, BUT, after visiting realclimate, and searching for Vezier, I found the article, and the link worked, and now it works from wikipedia too. --naught101 22:19, 5 February 2006 (UTC)

It works for me now too. Thanx to both of you for checking it out. I didn't want to assume it was a link gone bad.--Silverback 15:44, 6 February 2006 (UTC)

Something's wrong, I can't get my comments posted on Realclimate Hans Erren 23:39, 9 March 2006 (UTC)

Silverback wasting our time again

See where Silverback deletes "outside the scientific community" with the deceptive edit comment "not "especially"".

As to why he changed 4.5 into 5.5 despite the link IPCC ref saying 4.5 not 5.5, who knows? Just the spirit of malice? William M. Connolley 22:40, 5 February 2006 (UTC).

Perhaps you should assume good faith rather than leaping to the ad hominem attack. The explanation is a simple search for truth, and a proper level of scientific skepticism. I thought the 4.5 was a typo of this figure from the Shaviv and Veizer paper: "These results differ somewhat from the predictions of the general circulation models (GCMs) (IPCC, 2001), which typically imply a CO2 doubling effect of ~1.5–5.5 °C global warming, but they are consistent with alternative lower estimates of 0.6–1.6 °C(Lindzen, 1997)." Perhaps Shaviv and Veizer made a mistake, but I see no reason to impune their motives or mine. As to the subjective hyperbole about this being especially controversial OUTSIDE the scientific community, you know that was an inappropriate emotional snipe, implying that those that are a little more skeptical are somehow unscientific. It isn't consistent with our encyclopedic goal. As to the 4.5 vs 5.5 figure, I think we do have some problems here making sure we are comparing the right figures, and I am willing to work with you collegially to find the right answer.--Silverback 15:32, 6 February 2006 (UTC)

If you want people to assume good faith, stop making edits with deceptive comments to stuff that was heavily argued over and come to a long-term consensus on. Coming here and acting all innocent won't get you anywhere. Except reverted, of course. William M. Connolley 15:36, 6 February 2006 (UTC).

Of course! And assuming good faith, since you have given no reason and provided no citations, I assume you have reverted on the merits.--Silverback 15:50, 6 February 2006 (UTC)

"rv. Nothing "especially" controversial, of course"

It is just as controversial inside the scientific community, given the resignations from committees and significant questions raised by some scientitists, so there is no reason to imply that the controversy is mainly or especially outsite the scientific community, there is "especially" no reason to imply this in an encyclopedia. Do you have any specific criticism of the version that I proposed to replace this that you reverted?--Silverback 17:35, 6 February 2006 (UTC)

Nope. GW isn't controversial in the sci community. See Oreskes, for example. Of course, since you believe that Singer is a member in good standing of that community, we're actually talking about different things... William M. Connolley 17:39, 6 February 2006 (UTC).

"its becoming rather obvious why you got arbcommed", it isn't a mystery WMC, I got accused of personal attacks on 172, attacks which I was able to justify BTW, and the attacks were not ad hominem arguments instead of the merits on content, in fact they were unrelated to content but inspired by his abuses of the system such as you also experienced when he came to the aid of Sterling Newberry on this article. Frankly, I probably did hound him a bit much about those abuses and attemtps to game the system. Your ad hominem attacks, deletion of legitimate cited material, and insistence on hyperbolic and POV language and appeals to consensus rather than evidence are distinctly unscientific, not to mention in violation of wikipedia rules. But I still attempt to judge your posts on the merits. I recommend that you start "acting" as you have accused me of. Use reason to analyze your posts (and inflammatory edit summaries) for ad hominem content and then filter that out. We will all know based on past experience that you will be merely acting "scientific". I recommend using the "method", actually try to feel scientific, then with time, you may change, become the role you are trying to play. It will increase your credibility, not that personal credibility should matter, let's stick to the science.--Silverback 20:04, 6 February 2006 (UTC)

Sticking to the science is a good idea. Its why I removed Singer. William M. Connolley 20:25, 6 February 2006 (UTC).

I am not an expert in this topic, but I do read the serious scientific literature, e.g., Science and Nature, and William M. Connolley statement, " GW isn't controversial in the sci community", is consistent with my reading of that literature. Walter Siegmund (talk) 20:26, 6 February 2006 (UTC)

I read those too. With the corrected satallite data, GW is not controversial, but the level of attribution to human vis'a'vis nature and the reliability of the predicitions and extent of the effects are controversial within the scientific community. The 1.5 to 5.5 (or is it 4.5?) range discussed above is itself evidence of controversy. Look at the article, it is about more than GW, it is about attribution of GW. WMC's fear of contrary peer reviewed information it also evidence of controversy. Scientists have commented on the pressure to conform to the consensus and the difficulty gettting contrary research published in Nature or Science is evidence of controversy. Ad hominem attacks that don't stick to the merits are evidence of controversy. Etc. --Silverback 20:53, 6 February 2006 (UTC)

Controversy section

Apologies to SS for near-edit-clash. So... I cut the Lancet out, because its odd to have it make its first appearence here. Sci.op seems more natural. I haven't read the Lancet article, though. William M. Connolley 22:11, 11 February 2006 (UTC).

No problem. I found it a bit weird, too, but decided to at least fix it while wiser people decide what to do ;-). I only saw the Reuters article as archived on Common Dreams, not the original article. BTW, given German history, "SS" is not really popular here (except in some very stupid circles). I don't really mind, but I go by StS if I have to use initials myself. --Stephan Schulz 22:24, 11 February 2006 (UTC)

Hmmm, yes, perhaps I'm not wiser after all :-). StS or full names it is! William M. Connolley 22:31, 11 February 2006 (UTC).

I can't find the Lancet article. I checked the TOC for issues on either side of the Feb 9 date, and did an author search for McMichael for the past 12 months. Is there a specific cite for the article? Do we know if McMichael was one of the authors? Perhaps I missed a non-obvious article title. I can access the full text with a proper cite, if it really is in Lancet.--Silverback 12:12, 5 March 2006 (UTC)

http://dx.doi.org/10.1016/S0140-6736(06)68079-3 - A cursory skimming of the paper suggests that their opinions are being overstated in our article, but that they do make statements in the direction of existing climate change having already had averse health effects. Dragons flight 12:39, 5 March 2006 (UTC)

Thanx. Unfortunately it has only been published online so far. I can't access the full text yet.--Silverback 12:58, 5 March 2006 (UTC)

Aerosol cooling

OK, in an attempt to head off an edit war :-) I'll talk... StS's point about can-can is well taken, but I dislike the tone of:

Note that anthropogenic emissions of other pollutants - notably sulphate aerosol - can exert a cooling effect; this is one possible explanation for the plateau/cooling seen in the temperature record in the middle of the 20th century .

The objectional bit is ...one possible explanation...; it pretty well *is* the std expl (well, along with a bit of natural variation)... though I suppose the skeptics might find another. So I removed the first "can" - aerosols *do* exert cooling (does anyone doubt that? ).

William M. Connolley 13:38, 12 February 2006 (UTC)

Hey, what's wrong with a nice little edit war? ;-)

I actually considered putting it as "...this is one proposed explanation...", but was to lazy to dig out a source to support that version. --Stephan Schulz 15:16, 12 February 2006 (UTC)

Slightly more seriously, this is a question that keeps getting asked here and elseshere, e.g. . It should get a more detailed answer. William M. Connolley 17:38, 12 February 2006 (UTC).

Good Article?

In light of the peer review, and the FA plot, I've listed this as a Misplaced Pages:Good articles. Technically this is against the rules, as I've contributed a lot; but its a guideline not a rule so... anyway. My rationale is (a) it *is* good (based partly on the fairly mild crit from its PR, but mostly on what I know of it) (b) there is a fair chance of it not getting through FA for one reason or another. Comments welcome. William M. Connolley 23:09, 18 February 2006 (UTC).

Oh, and to add: the GA criteria are:

• be well written
• be factually accurate
• use a neutral point of view
• be stable
• be referenced, and
• wherever possible, contain images to illustrate it. The images should all be appropriately tagged.

This article is definitely referenced; contains images (not many pics, but many excellent graphs); is stable; is factually accurate. I would also argue that its NPOV, though some may disagree. Is it well written? Maybe. William M. Connolley 23:11, 18 February 2006 (UTC).

And... its better than Post-glacial rebound which is also a GA :-) William M. Connolley 23:14, 18 February 2006 (UTC)

I agree that it's a GA. I don't think it can make it as a featured article while it still has that "citation needed" bit. Also, while it's generally well-written, there are some clumsy sentences: "Uncertainties in the representation of clouds are a dominant source of uncertainty in existing models, despite clear progress in modeling of clouds".

This article has piqued my interest; I'll be looking over it to see if there's anything I can do. I know next to nothing about global warming, but I'm pretty good at stylistic touch-ups. :) --Ashenai 23:49, 18 February 2006 (UTC)

Citation format

IMO, footnotes are cleaner, and some of the text cites print sources anyway (ie. that "Veizer et al. 2000, Nature 408, pp. 698-701" citation), which is a bit ugly right in the middle of an article. Reason given well, this is an article, not a scientific journal — we do want to maintain a standard but articles are expected to be easy to be read by the laypeople, so I think we should maintain a degree of prose. Footnotes are a good way to integrate both print sources and online sources cleanly, so I think we should be prepared to convert them sooner or later — this is just to tidy it up before we do FAC, we have to copyedit the other stuff first as a priority. Thoughts? Elle _{vécut heureuse} (Be eudaimonic!) 16:10, 22 February 2006 (UTC)

Hmm... footnotes are cleaner: gag. What does cleaner mean? I want an inline link to link directly to the source document (my habit is to right click to open in a background page while reading on). Unless footnotes have been fixed to avoid the absurd bounce to a footnotes section to find the link, I would strongly oppose footnotes. The article can be clean and yet preserve true inline links (with of course a reference section below. This is an internet document, not paper, and quick and easy linkability is of prime importance. I would oppose FA if footnotes are a requirement - wasn't aware it was a requirement. Vsmith 00:45, 23 February 2006 (UTC)

As in, it's more...aesthetic, and something such as "pg. 71, etc." doesn't interrupt the flow of the article (it is prose, after all)...I do use firefox tabs, but then I would just click on the citation, open the link in a new tab (it is numbered) then click back up again (IMO, this is more convenient)....we have to integrate it, at least — having inline links and print source references that link into the print sources section is not very integrated, IMO. Elle _{vécut heureuse} (Be eudaimonic!) 15:10, 23 February 2006 (UTC)

Well, it's two too many clicks, unacceptable for a web document. This is not paper. Also my preference is for Harvard style reference links, both for paper and web refs, with the refs all arranged alphabetically in the ref section (web & paper together). Numbered links are meaningless - Harvard links carry meaning. Vsmith 02:06, 24 February 2006 (UTC)

My personal aesthetic preference is for inline links to web based materials and Harvard style reference (e.g. "Schuster et al. 1990") for references to print materials. Dragons flight 16:31, 23 February 2006 (UTC)

It will come as no geat surprise to those who have been following various events that I rather prefer inline links. William M. Connolley 16:48, 23 February 2006 (UTC)

On a more general note (and I've tried to discuss this elsewhere, with no sucess) my belief is that cite.php is almost capable of doing inline/footnote at the press of a config option. I envisage an ideal situation (in half a year or so...) when the refs will be put in with cite, and at the top of the page there will be a wiki-format-string:ref-style=inline option; but that if ref-style=footnote is set in the users preferences they will see that instead. Then we will all be hap-hap-happy :-) William M. Connolley 16:48, 23 February 2006 (UTC)

While we're dreaming, it would be nice if there were two buttons for references with external links. One which takes you to the footnote, listing the source, when it was accessed etc, and another small button taking the reader directly to an external page. Of course, this risks slippery slope of increasing the amount of clutter, markup and crap you can accidentally click on, but I think it would be useful and preserve the best aspects of both systems. –Joke 22:54, 23 February 2006 (UTC)

Nice idea. William M. Connolley 23:03, 23 February 2006 (UTC)

Nice dream - and might as well make 'em invisible in a printout for the paper lovers :-) Vsmith 02:06, 24 February 2006 (UTC)

Missing the point

I'm not a scientist, but I think this article entirely misses the point about the GW issue. These "extra" CO2 emissions will hang around in the atmosphere (causing havoc) for decades or even centuries. Even if we stopped burning all fossil fuels tommorow and stopped slashing down the rain forest, CO2 emmissions would be decades away from returning to normal - if ever. This point is lost in most mediad discussions of this issue. Misplaced Pages should do better. —The preceding unsigned comment was added by 4.36.244.4 (talk • contribs) .

Uh...actually the article does address the point. The article is not even advocating or focusing on solutions, it's in fact focusing on whether or not it is happening. It does discuss mitigation of global warming as a separate section, but it doesn't dominate the article. Elle _{vécut heureuse} (Be eudaimonic!) 22:02, 22 February 2006 (UTC)

Do we explicitly address expected lifetime of CO2? There is a decent RC post on this by David Archer but I'm too p*ss*d right now to find it :-))) William M. Connolley 00:10, 23 February 2006 (UTC)

Is that in the Australian sense (usually involving beer) or the continental version ("off")? Or is the a BE meaning that eludes me? --Stephan Schulz 17:39, 23 February 2006 (UTC)

Oh no more language issues. In the UK, its the same as "wazzed" or "newted" :-) William M. Connolley 19:02, 23 February 2006 (UTC)

Ummm, okay. So you just explained an ambiguous word by comparing it to two totally mysterious words. Is there a translator in the house? Dragons flight 19:11, 23 February 2006 (UTC)

I've never heard of "wazzed" or "newted" before either, but according to this web page, they're both slang for "drunk." --Sheldon Rampton 19:18, 23 February 2006 (UTC)

Trolleyed more like.--NHSavage 19:57, 23 February 2006 (UTC)

To be serious now, I don't think this article does address the lifetime of CO2 or the thermal lag associated with deep ocean warming. However, perhaps this whole discussion of timescales in the system requires an article to itself. It needs some careful thought about how to include it here.--NHSavage 20:13, 23 February 2006 (UTC)

*Burp* - oops. OK, I added Note that although most studies focus on the period up to 2100, warming would be expected to continue past then, since CO2 has a long atmospheric lifetime. to partially address this point. A proper discussion of CO2 lifetimes probably belongs under greenhouse gas though (?). William M. Connolley 21:26, 23 February 2006 (UTC).

Clathrate gun section

I took out this whole section, since much of it appears to be lifted direct from Nature. Fortunately someone else has ripped it off http://groups.yahoo.com/group/ClimateConcern/message/9624 so you can check... :-) William M. Connolley 21:23, 23 February 2006 (UTC)

bias

A non peer reviewed blog reference replaced my peer reviewed IPCC tar reference. Hans Erren 11:03, 25 February 2006 (UTC)

Could you be a bit vaguer, please? William M. Connolley 11:48, 25 February 2006 (UTC)

I think he is talking about the lifetime of CO2 in the atmosphere. Hans, your quote was somewhat out of context. The Archer article that William linked to goes into much more detail. It is not in itself peer-reviewed. However, it it written by an expert and cites peer reviewed papers, including at least 5 by the author (I did not check the "et al"s), at least two of which are very recent. If you read the RealClimate article, you can see why no single lifetime can be given. A lot of the CO2 is absorbed by "fast" processes ("fast" meaning years to centuries, with an average of centuries), but about one quarter is only absorbed via slow geological processes, i.e. over very long periods of time. On the time scale we are talking about, "CO2 has a long atmospheric lifetime" is true for either process, although the long tail often seems to be ignored. --Stephan Schulz 20:04, 26 February 2006 (UTC)

Move of two external links to talk page

These links bring up valid issues, but I don't think they belong on the global warming page itself, so I've moved them to this talk page for now.

• Climate Expert Says NASA Tried to Silence Him - New York Times article on efforts by the Bush administration to muzzle Dr. James Hansen
• Debate on Climate Shifts to Issue of Irreparable Change

Evolauxia 06:23, 27 February 2006 (UTC)

Consensus

Could someone reference "The scientific consensus on global warming is that the Earth is warming, and that humanity's greenhouse gas emissions are making a significant contribution."? Thanks. —The preceding unsigned comment was added by Calion (talk • contribs) ..

See the next few sentences. Sources are the IPCC TAR, as well as various declaration by the national academies of science. There are more detailed sources on Scientific opinion on climate change.--Stephan Schulz 21:41, 27 February 2006 (UTC)

Some breaking news here. Count Iblis 13:53, 1 March 2006 (UTC)

Bear in mind that this is the AR4 draft, which has "do not cite or quote" written all over it. And in fact it isn't even that, just the Beeb reporting on it. William M. Connolley 16:07, 1 March 2006 (UTC)

"The Intergovernmental Panel on Climate Change (IPCC) formerly said greenhouse gases were "probably" to blame." Can anyone get access to the report and give summary to it's finding? FWBOarticle

The IPCC TAR is online William M. Connolley 18:07, 1 March 2006 (UTC).

I believe this talk page ought to be archivied. Not only I fail to spot this section in the begining, it took a while for me to find where you transfered my edit. FWBOarticle

What's wrong with utterly NPOV?

I prefer "utter" NPOV to shameless kowtowing to the industry-funded apologism claiming lack of certainty any day of the week, and this article is self-contradictory if it says any less. --James S. 23:15, 28 February 2006 (UTC)

Should have said POV. Please remeber WP:NPOV which certainly fails: The relationship between global warming and hurricanes is still being debated by hold-outs in major governments and industries who have paid people to argue against the scientific evidence.. Its also simply factually wrong, as the WMO report pdf I added demonstrates. You've also added your pet "global average wind speeds" which has no justification that I know of, and none that you;ve been able to find. Etc. William M. Connolley 23:33, 28 February 2006 (UTC).

The statement about governments and industry paying people to argue against consensus was properly sourced , even if I did misread the wind speed calibration as covering different time periods (and I'm still not sure it doesn't.) --James S. 02:53, 1 March 2006 (UTC)

You didn't misread the wind speed study because you didn't even read it. You just stuffed in the first google hit for global wind speed increase without thinking that those terms can be combined in different ways. You have used yet another misleading edit summary - you have simply re-inserted your assertion that global wind speeds have increased, without any pretence of supporting evidence. Its clear that you have logially deduced from first principles (shared by no-one else) that global wind speeds *must* have increased and are intent on inserting this piece of original research. Please give up, until you can find something that is actually to the point (which I very much doubt you will find, because I don't believe that the effect exists). And all the rest is poor too. William M. Connolley 10:09, 1 March 2006 (UTC)

I admit I misread part of the study. However, as you infer, I am not done looking. And yes, when temperature and evaporation increases, then it is clear to me from first principles that wind speed and rainfall will increase too. You have no evidence that it doesn't, because there can be no such evidence. --James S. 19:37, 1 March 2006 (UTC)

You're still making things up. Why is it clear to you from first principles that wind speed must increase? Its not clear to anyone else. If its so clear, why is it not in any met papers or textbooks or... anywhere? Why can't you admit that the paper you found is irrelevant? If it isn't irrelevant, please quote a relevant part of it that supports your contention. And why are you so certain of your answer, when as you now freely admit, you're still looking for papers to prop it up with? William M. Connolley 20:23, 1 March 2006 (UTC)

Temperature is related to gas volume. Greater atmospheric forcing means greater day/night temperature gradients, meaning more thermal expansion and contraction, meaning more wind. What exactly is made up about that? All that remains is emperical confirmation, and I am still not convinced that it doesn't already exist in the cited report or one of its references (or their citators.) I see no need to temper my statements in deference to the admittedly economically conflicted arguments against the consistent truth of the remainder of the articles. I am sad that some feel so strongly about the value of their kowtowing to industry and conflicted government interest that they are reduced to spewing forth falsehoods and absurd rhetorical questions. --James S. 20:34, 1 March 2006 (UTC)

You really are making this all up, aren't you? The diurnal temperature range is *decreasing* not increasing . I love your All that remains is emperical confirmation... - yes, you've made up you mind in total absence of any facts, but now you're going to try to find some. Sigh. William M. Connolley 20:54, 1 March 2006 (UTC)

I don't know who BSbuster is (not me), but I thank him or her for their comments which are reproduced below. --James S. 20:06, 8 March 2006 (UTC)

Connolley represents as a standard what he knows (AFAIK), misconstrues N's arguments and then launches a personal attack ("he doesn't understand"). N wrote nothing about winds in general. N refers to a widely discussed effect of radiative warming on Wind produced from differences in barometric pressure. A 2005 National Research Council report concluded regional variations in radiative forcing may have important regional and global climate implications that are not resolved by the concept of global mean radiative forcing. and Regional diabatic heating can cause atmospheric teleconnections that influence regional climate thousands of kilometers away from the point of forcing. If there is any debate, it is over the degree of wind increased caused by radiative forcing. Connolley perhaps should be the subject of a RFA instead, debating in bad faith by launching personal attacks against writers who cite literature instead of debating the content of the cited literature, then mischaracterizing the debate he refused to participate in. Connolley's sustained involvement in edit wars, RFAs and unresolved conflicts warrants investigation. BSbuster 02:40, 4 March 2006 (UTC)

BSb is patently a sock; most likely of you, though who knows: see her contribs: BSb's contribs. And of course her comments above are all beside the point; and don't support your nonsense about global average windspeed at all. William M. Connolley 09:51, 9 March 2006 (UTC)

Just a couple of questions

Pardon me but as a mere casual observer I am wondering if this whole discussion of global warning is overlooking at least a few fundamentals.

The Misplaced Pages article on the earth's atmosphere points out that the percentage of Cabon Doxide in air is .035% (365 ppmv). How can changes in such a minute component cause any great effect (temperature or otherwise)on something so large and complex as the earth's atmosphere?

You might just as well ask, how can the trace amounts of CO2 be of any importance to plants? Yet they are. The answer is that trace quantities can easily be important, since (as the greenhouse gas article points out, N2 and O2 are radiatively inactive in the IR). William M. Connolley 19:48, 8 March 2006 (UTC)

Just let me add one thing: The fact that the 0.035% of CO2 in the atmosphere does have a profound effect on the climate is not disputed by any reasonably informed person. It is recognized by all scientist I've ever heard on the topic, including the usual sceptics like Singer et al. To put things into perspective: A resonable knife has a volume of (generously) 30 cubic centimeters. Yet sticking it into the 100000 cubic centimeters of a somewhat bulky person like me can have a very profound effect on that person. Or, more fittingly, consider the relationship between an inflated balloon and its skin.

And while the relative amount of CO2 is small, the absolute amount is significant - it amounts to roughly 0.5kg per square meter (unless I miscalculated). Do you agree that wrapping all of earth into a heavy-duty garden foil would influence the climate?--Stephan Schulz 22:08, 8 March 2006 (UTC)

You seem to be saying that CO2 is forming a heat shield around the earth like a skin (or garbage bag balloon). If so I observe that at .035 percent of the atmosphere CO2 seems to be a super molecule – everywhere at once. On the one hand it is down at the level of the grasses and flowers to allow them to do what they do. On the other hand it is also a layer above the tallest trees and mountain ranges (above the perforating “knifes” or pin points) dense enough to shield heat (warmer lessor molecules) in. Is the solution to global warming simply to puncture this shield with some kind of multiple pin points to let the heat out? By the way, isn’t adding plants to the discussion changing the subject? Plants do what they do at the current levels of CO2. The theory of global warming assumes rising CO2 levels which would seem to benefit plants wouldn’t it? Check with your reasonably informed people. The heat shield idea seems full of holes to me.

Just a couple of points. First, it's not a solid "heat shield"; every C02 molecule in the atmosphere does its part by reflecting a little bit more heat back down to the earth. Second, the C02 is pretty uniformly distributed through the atmosphere, so yes, it is everywhere at once. That is, anywhere you take a sample of air, it will be 0.037 percent or so CO2, no matter where you take your sample. It's not a single "layer" -- it's just the atmosphere. Take a look at Greenhouse effect. And please sign your posts with "~~~~". Thanks. bikeable (talk) 06:38, 9 March 2006 (UTC)

(Reply to unsigned). I didn't actually say that CO2 is "forming a heat shield like a skin". Your original argument was (paraphrased) that "0.035% is so little, how can it have a significant influence!". I just pointed out that 0.035% is not that small, and that there are a lot of situations where something that small can have an extraordinary effect on the larger (100%) system. Similar with William: He pointed out that the "small" amount of 0.035% CO2 is all that keeps plants alive - again, a relatively small amount can have profound influence on a large system. I also pointed out that the absolute amount of CO2 is quite high, and that, as such, it is not that surprising that it influences our climate. As Bikeable described, CO2 helps to retain heat because it absorbs infrared radiation emitted by the surface (towards space), but reemits it omnidirectionally. Hence it reduces the amount of radiation that escapes into space. For this effect, what is relevant is the average number of CO2 molecules encountered by a photon traveling from the surface to beyond the atmosphere. It is (to a first approximation) irrelveant where it encounters them.

About the plants: First, CO2 levels are rising - that is not a theory, its an observable fact. The (well supported) theory is that this will lead to an increase in the average temperature via an increased greenhouse effect. We are now also observing this (although it is harder to measure than CO2 content in a well-mixed atmosphere). For plant productivity, check the section on "positive effects" in the main article. In some areas, plant growth is limited by CO2 availability. These areas may experience an increase in bioproductivity. However, this can still lead to a decrease in biodiversity, as established long-lived species are being displaced by more mobile and adaptive species. Wether this is good or bad for the ecosystem in the long term is debatable. It is almost certainly bad for us humans in the short and medium term, because we are adapted (both biologically and economically) to the current situation.--Stephan Schulz 22:27, 9 March 2006 (UTC)

The Misplaced Pages timeline on thermometers says that Galileo built the first one in 1592. A search on "age of the earth" yeilds an estimated age of 4.55 billion years. Assuming the best case that humans could have perfect temperature data on all parts of the atmosphere since the thermometer's invention, how could the short 414 year histroy of temperature data predict the future temperature trends of something 4.55 billion years old with its highly variable history from unknown causes?

Predictions of future temperature don't much depend on the past history. But check out temperature record for how the past record is constructed William M. Connolley 19:48, 8 March 2006 (UTC)

But all climate change models are based on historical data, obviously they can’t be based on future data. Also, one can’t study warm periods of the earth’s climate by looking at the glacial record. Relevant glaciers would have melted away.

If I need to create an account and log in to start this dicussion let me know.

No need, but it would make it more convenient to both you and us.--Stephan Schulz 22:08, 8 March 2006 (UTC)

Thank you,

per_1062@earthlink.net

Perhaps missing from the above answers is also some perspective on whether the effect of the CO2 is a "great" effect. There are perspectives in which it is a small effect. Looking at the measured warming in terms of degrees Kelvin, i.e., relative to absolute zero, the effect is small. Why is the possible impact on human lives so "great" then? Human's live very close to the freezing point of water, in the narrow range where water is liquid at atmospheric pressures. Close to the freezing point of water, small changes in absolute temperature can have relatively large changes in the vapor pressure of water, and because of this, phase changes in water play a large part in the energy transport on the surface of our planet and are very sensitive to temperature increases, especially in the oceans. So a minisule percentage increase in the absolute temperature can represent a several percent movement between the freezing and boiling points of water at atmospheric pressure. Even the small absolute changes in temperature between summer and winter, have huge effects on energy transport in the atmosphere, for instance hurricanes practically disappear in the winter. So it is more than just temperature differences between the tropics and the poles which drive these phenomena, they become far more likely when the water temperature distances just a few more degrees from the freezing point.--Silverback 08:40, 9 March 2006 (UTC)

Very nice. Is this (should this be) in an article somewhere? And does this section suggest we should have another go at a simplified version of "GW for Beginners"? (I remember WMC started something like that, what happened to it?) Rd232 08:56, 9 March 2006 (UTC)

I like the idea of "GW for beginners", addressing commonly misunderstood points like the "heat shield" idea above. bikeable (talk) 21:52, 9 March 2006 (UTC)

Simplified version?

I started Global warming/Global warming (simplified) at one point but it didn't get far :-(

William M. Connolley 22:06, 9 March 2006 (UTC)

External links

Can someone please clean up the "External links" section? It's well on its way to becoming a WP:SPAMHOLE. Melchoir 12:06, 17 March 2006 (UTC)

I took 2 out, but it needs more work. People just kee adding them... William M. Connolley 12:40, 17 March 2006 (UTC)

volcanic emmisions of methane

Here is a source , although it is generally known that methane is emitted by volcanoes. The climatic effects of the sulfur dioxide and carbon dioxide are probably greater. This study finds that much of the methane release from resting volcanoes is probably from the interaction of hydrothermal systems with sedimentary rocks, but Mt. Baker for instance, based on isotopic analyses has a higher magmatic CH4 component.--Silverback 14:22, 17 March 2006 (UTC)

According to that study, geologic sources are 8.5%, but thats total geologic sources:

Major GEMs are related to hydrocarbon production in sedimentary basins (biogenic and thermogenic methane), through continuous exhalation and eruptions from more than 1200 onshore and offshore mud volcanoes (MVs), through diffuse soil microseepage, and shallow marine seeps; secondarily, methane is released from geothermal and volcano-magmatic systems.

which makes volcanoes one part of the "secondary" part, so why pick them out? If you meant MV's, thats not what most people are going to think of when they hear "volcano". William M. Connolley 16:13, 17 March 2006 (UTC)

I didn't pick it out, methane was being discussed. The existing language gave the impression that all sources were biological or anthopogenic. Vulcanoes are an example that isn't, although upon researching it, the contribution was poorly understood because it is a difficult environment in which to measure it. It is definitely a smaller contribution than I had been thinking. The MVs and hydrothermal plumes are more important.--Silverback 18:45, 17 March 2006 (UTC)

• Misplaced Pages good articles
• Undated GA templates
• Good articles without topic parameter
• Old requests for peer review