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Marcus at 21:59 PM on 13 June 2010How climate skeptics mislead
Also Iff, its not like the theory of AGW just appeared & gained acceptance overnight. No, it required an enormous amount of work-over multiple generations-to discover & bring together the various lines of evidence which explained how & why the planet was warming at the rate it currently is-& how & why humans are responsible. When the so-called skeptics are prepared to invest the same time & energy into developing an alternative theory to explain recent warming trends-instead of clinging to skepticism on strictly ideological grounds-then they might regain some measure of credibility. -
Berényi Péter at 21:59 PM on 13 June 2010How climate skeptics mislead
#36 Marcus at 21:30 PM on 13 June, 2010 if it was a strictly linear effect induced by increasing population density-then why is warming occurring fastest in parts of the world which show the *slowest* rates of increase in population density (i.e. in the rural parts of the world)? You are not listening. UHI is not a linear function of population density, it is a linear function of the logarithm of it. Big difference. You can have a slow increase in absolute numbers at sparsely populated areas while a huge UHI effect at the same time. -
Marcus at 21:55 PM on 13 June 2010How climate skeptics mislead
Iff, genuine scientific skepticism is to *not* accept any claim until you've seen evidence to back it up, & a willingness to accept contrary evidence should it come to light. Yet to this date, the majority of so-called "skeptics" have failed to produce any contrary evidence to debunk anthropogenic global warming-instead choosing to come up with half-baked hypotheses that don't stand up to scrutiny by any half-way impartial reviewer. They spend the rest of their time launching crude ad-hominem attacks on climate scientists & trying to influence the mainstream media with anti-AGW PR campaigns. All of which I'd call entirely *antithetical* to science! -
lff at 21:50 PM on 13 June 2010How climate skeptics mislead
Couldn't "The case for human caused global warming is based on many independent lines of evidence." just be seen as an example of a robust confirmation bias? Are there no sources that throw doubt on any of the individual conclusions of the "independent lines of evidence"? Are there no lines of evidence showing global cooling or a less drastic global warming or a non-human caused Global warming? Can there be no legitimate skepticism of AGW? To my mind only ideological epistomologies would be immune from skepticism but that would make AGW antithetical to science. lff -
Marcus at 21:46 PM on 13 June 2010How climate skeptics mislead
Another point, BP. Between 1900 & 1964, the global population more than *doubled* (1.6 billion people to 3.3 billion people), yet the rate of warming measured over that time period by ground-based stations was about 0.06 degrees per decade. Between 1965 & 2006, the global population *almost* doubled (3.3 billion to 6.5 billion people), yet the rate of warming measured by ground-based stations was +0.154 degrees per decade). So if warming was entirely down to population-density induced UHI, then we would have expected a greater rate in measured warming in the first 65 years of the 20th century (especially when you *also* consider rising sunspot activity & lack of volcanic activity). Seems that neither Dr Spencer-nor yourself-have actually thought this through very well! -
Marcus at 21:34 PM on 13 June 2010How climate skeptics mislead
HumanityRules. The problem is that, for most of the things John mentions, natural variation suggests we should be moving in the *opposite* direction. After all, after CO2, the primary driver of our climate is solar activity. Over the last 30 years, solar activity has been trending *downwards*, yet global temperatures are rising faster than at any other point in the past 150 years of temperature records-even when solar activity was rising quite rapidly. So, in the absence of rising solar activity, how else can *you* explain all of these events that John describes? -
Marcus at 21:30 PM on 13 June 2010How climate skeptics mislead
I'm not "talking about something else" BP-my question relates directly to the clearly false claim that UHI effect can explain the warming of the past century. After all, if it was a strictly linear effect induced by increasing population density-then why is warming occurring fastest in parts of the world which show the *slowest* rates of increase in population density (i.e. in the rural parts of the world)? Why does temperature first peak in the 1940's, then fall away around the 1950's (if it was simply down to population density induced UHI, then the warming should continue unabated)? How come Dr Spencer is apparently the *only* man who can see, & correct for, the UHI-even though dozens of other researchers apparently can't-when he is apparently unable to see, & correct for, the diurnal drift in his own satellite temperature measurements? If UHI is such a big effect, as you & Spencer claim, then it should show up in a comparison between ground-based & satellite-based temperature measurements, yet they're almost identical (even when you allow for Spencer's failure to account for diurnal drift). So your attack on my post is really just a desperate attempt to distract people from the fact that you can't answer a number of *very* obvious questions (including the one by ProfMandia about warming over the oceans-which is also relevant in terms of debunking the whole UHI argument). Still, at least your post serves as a fantastic object lesson about how the skeptics seek to deceive & distract people. -
daniel at 21:23 PM on 13 June 2010There is no consensus
Nor is a popular hypothesis truth. The article refers to a consensus amongst scientists apparently evidenced by a survey, literature searches and a list of endorsing scientific organisations and although this may be a start in proving an overwhelming consensus amongst scientists outside of the earth sciences I feel it does not adequately gauge the level of dissent. Further to this I point out the potential for group think within the climate sciences as outlined above. Which in my own opinion (to which I am entitled and I utterly reject any idealised notion that science is devoid of opinion or opinions, look up the definition of consensus and you will find it is a pluralised synonym of the word opinion) highlights the fact that just because something is published that does not automatically guarantee a quality of work. On top of that I would argue that many qualified professionals outside of the earth sciences may not even be engaging in a thorough critique of the data due to a lack of time or interest or perhaps an unjustified trust that work being done in fields distant to their own is of the same standard they would expect in thier own circles. -
Berényi Péter at 21:21 PM on 13 June 2010Is the long-term trend in CO2 caused by warming of the oceans?
#24 Ned at 08:19 AM on 12 June, 2010 I've been looking for that [i.e. argon]. I can't find anything anywhere. Was it your own idea, or has someone else suggested this? It was my idea. It happens sometimes. However, it might not be as bright as I thought, for a two order of magnitude error has slipped into my back-of-the-envelope calculation somehow. With a closer look it turns out mass of argon dissolved in water is only about 2.4% of all the argon in atmosphere+hydrosphere. Therefore the global argon thermometer is not terribly sensitive to changes of ocean temperature. However, if measured with high enough precision, can still lend information on OHC. -
Andrew Hobbs at 21:06 PM on 13 June 2010Sea level rise is exaggerated
I know this is a bit late in the day but considering the nature of this site I thought it would be worthwhile to make a comment. Scientists from Flinders University, Adelaide, certainly DID NOT abandon the project. The following statement comes from their financial statement for 2003. "In 2003 the University decided to cease the operations of the National Tidal Facility Australia (NTFA). The NTFA fulfils an important national role as it specialises in tidal predictions, sea level monitoring and contemporary marine science issues. However as it is not involved in the University’s core teaching and research activities, it was decided that it is more appropriate for the services to be provided by the Commonwealth Government. The operation was transferred to the Commonwealth Government effective from 1 January 2004." It is possible to access their latest results on the Australian Bureau of Meteorology website at the web page for the South Pacific Sea Level and Climate Monitoring Project. These results support the general rate of global sea level rise noted elsewhere. -
Berényi Péter at 21:01 PM on 13 June 2010How climate skeptics mislead
#28 Marcus at 19:25 PM on 13 June, 2010 If UHI is as strong as you claim, BP, then why are ground station measurements (+0.17 degrees per decade since 1979) so close to those calculated by satellite measurements (+0.14 to +0.16 degrees per decade since 1979). You are doing the same thing most everyone seems to do here. Talking about something else. several studies have shown that the difference between so-called "good" & "bad" stations is absolutely negligible You are echoing the claim promoted by RealClimate. "the UHI effect makes at most a contribution of 0.05°C to the warming observed over the past century" It is equivalent to saying if local population density in an area is doubled, temperature readings would increase by 0.027 K (while the actual value is close to 0.16 K). To refute this, no detailed scientific study is needed, just a bit of common sense. If it were true, the phenomenon called UHI (Urban Heat Island) would never even be noticed. BTW, the difference between "good" & "bad" stations in itself does not have much to do with UHI effect on temperature trend. The difference between logarithmic local population density trends have, and studies referenced by RealClimate only show this trend must have been a bit higher for stations flagged "rural" in GHCN than for stations flagged "urban". If anything, this implies GISTEMP practice of adjusting urban trends to surrounding rural readings introduces some more warming bias, not less. #30 Riccardo at 19:41 PM on 13 June, 2010 could you please explain how did you build the graph you show? I could. However, please read #10 & #27 first carefully, follow the links provided, try to understand what is said. Having done that you'll most probably understand the graph. If not, you can still ask specific questions. The answer would be detailed enough to be scrutinized thoroughly. That's the only way to proceed. -
David Horton at 20:32 PM on 13 June 2010How climate skeptics mislead
The skeptics on this blog constantly suffer from the can't see the forest for the trees syndrome. HR #31 sums it up "AGW isn't the only explanation for each of these observations", well, possibly, but I suggest you would have a hard time coming up with alternatives for them. Whanna try? But that isn't the point, even if you could come up with a series of disparate (and my guess would be, often contradictory) explanations. These things are happening at an incredibly fast rate. They are happening at this incredibly fast rate at a time when CO2 levels are rapidly increasing. We know the causal relationship between those two things. Every observation of the natural and geographic worlds fits consistently with this single theory. A Darwin said, about evolution, find just one piece of evidence against it and the whole theory collapses. Same here. Want to give that a try Mr Rules? -
Riccardo at 20:30 PM on 13 June 2010How climate skeptics mislead
HumanityRules, unfortunately no one still came out with comprehensive alternative explanations. As John says in this post, the "strategy" is to pick them up one by one. And please notice, skeptics love to endlessly repeate the mantra that the "AGW camp" does not consider natural variations. It's simply untrue, it's just the hope that repeating something enough times will make it true. -
Riccardo at 20:21 PM on 13 June 2010How climate skeptics mislead
actually thoughtfull, you're actually right that WUWT is not even to be considered when talking about the science of global warming. Unfortunately it's the most quoted source of skeptc arguments and way too often even skeptic scientists use it for their claims that would not pass peer review. Like it or not, we have to live with it. -
HumanityRules at 20:11 PM on 13 June 2010How climate skeptics mislead
The problem I have is that even when you present extensive lists of data such as •Ice sheets are melting •Sea levels are rising •Biological changes in tens of thousands of species •Glaciers are retreating •Seasons are shifting •Species are becoming extinct is that AGW isn't the only explanation for each of these observations. You describe sceptics as being myopic but I'd say your own explanation suffers from tunnel vision by ignoring natural variations in the climatic and biological systems.Response: "The problem I have is that even when you present extensive lists of data ... is that AGW isn't the only explanation for each of these observations"
Agreed, evidence of global warming doesn't necessarily prove human caused global warming. Which was why I preceded it with the various lines of evidence for a human fingerprint in climate change:- From space and the Earth’s surface, we see more heat being trapped by carbon dioxide
- Nights are warming faster than days
- The upper atmosphere is cooling while the lower atmosphere is warming
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Marcus at 19:51 PM on 13 June 2010Is the long-term trend in CO2 caused by warming of the oceans?
The Ville. In answer to your above question. Its true that a decline in the C13/C12 ratio could be attributed to either vegetation or fossil fuel use-but that's not what is being claimed here. The claim is that warming has caused the oceans to liberate the CO2 stored as HCO3 (even though the CO2 *precedes* the warming by a good couple of decades!) CO2 liberated from a purely inorganic source like this should not impact the long-term ratio of C13/C12, yet Mauno Loa data shows that the C13/C12 ratio is definitely declining-so ocean sinks *cannot* be the source! Its also unlikely to see how modern vegetation can be the source, as plants are a net CO2 sink-even in warmer climates. Its only in periods of extended droughts when trees become a net releaser of CO2. Even then all available evidence suggests that, even under these conditions, the trees don't release enough CO2 to account for such a significant rise in CO2 (to levels unseen since before the Quaternary Era!) -
Riccardo at 19:41 PM on 13 June 2010How climate skeptics mislead
Berényi Péter, could you please explain how did you build the graph you show? -
Marcus at 19:41 PM on 13 June 2010How climate skeptics mislead
@ actually thoughtful. Is that the best that these guys can come up with? Well I can easily debunk 3 out of 4 of these arguments without even breaking a sweat: 1) Antarctic Ice Sheet: though it's true that total ice sheet *thickness* has increased slightly since the 1970's, ice sheet *mass* (as measured by the GRACE satellites) has actually been *shrinking*. All of the increased thickness has been *inland* & restricted to the Eastern half of the continent. This increase in inland thickness-at high altitude-is consistent with warming-induced changes to precipitation in the Southern Ocean, the same precipitation which has caused a significant increase in calving of the sea-ice. 2) Warming from 1900-1939 vs 1970-2009: From 1900-1939, the planet warmed at a rate of +0.08 degrees per decade, which isn't surprising given that sunspot numbers increased at an average rate of 9.9 per decade over that same period. From 1970-2009, the warming rate was +0.16 degrees per decade, at a time when sunspot numbers *fell* at an average rate of 9 per decade-so its an "apples & oranges" comparison! 3) Negative effect from clouds: as has been pointed out numerous times before, clouds act as both a negative & positive forcing. Yes they increase the Earth's albedo, but they also act to trap more IR radiation as it heads out to space. Lindzen suggested that an increase in the Iris Effect would provide a negative feedback for CO2 induced warming-by reducing the clouds that help trap IR radiation in the lower atmosphere. However, the CERES satellites showed that the Iris effect lets more radiation *IN* than it lets *OUT*, thus providing a modest *positive* forcing. I'd debunk argument number 4 too, except I don't understand what you mean by the question! -
Marcus at 19:25 PM on 13 June 2010How climate skeptics mislead
If UHI is as strong as you claim, BP, then why are ground station measurements (+0.17 degrees per decade since 1979) so close to those calculated by satellite measurements (+0.14 to +0.16 degrees per decade since 1979). The reality is that the entire premise of Spencer's argument is totally false-which is that adjustments aren't frequently made to account for UHI effect. Indeed, Spencer himself has a habit of failing to adjust his own satellite data to account for diurnal drift, so maybe he wrongly assumes that those on the ground are making the same basic error (which is why his readings are +0.02 degrees per decade cooler than those provided by RSS). Of course, even *if* the adjustments were not being made, several studies have shown that the difference between so-called "good" & "bad" stations is absolutely negligible. -
Berényi Péter at 18:20 PM on 13 June 2010How climate skeptics mislead
#15 ProfMandia at 13:17 PM on 13 June, 2010 How much has the population grown over the oceans? Dear prof, I was talking about UHI, which obviously occurs only in land records. Oceans is another issue which should be discussed separately. I am sure you would not be happy either if at an exam a student in reply to a specific question would start talking about something else. The only legitimate way for you to refute Dr. Spencer's finding (which I have moved a step further by quantifying the effect) is to point out specific errors in the specific study.
Simple handwaving or changing of topic would not do.
Of course it is only a first approximation, so the actual numbers may be slightly different. Proper correction may be variable over time and space as well, since population growth was uneven. Also, the huge decrease in number of GHCN stations after 1990, especially urban ones is not taken into account here.
There is certainly room for improvement but it would be nice to see the guys who are responsible for it doing their job instead of someone with no time and resources.
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actually thoughtful at 17:50 PM on 13 June 2010How climate skeptics mislead
Some recent posts, this one included, seem to be aiming for the low end of the food chain (WUWT). So you are fighting deniers - simple, easily refuted arguments. But there are skeptic sites - like The Air Vent and The Blackboard for example - that present arguments that are both more sophisticated and more honest. Recent topics there that have left me wondering are: 1) Given little change to the entire antarctic ice sheet - how much of the arctic ice sheet is due to wind and currents - ie seasonal variation. 2) They point to the warming trend from the 1900-1930s (not sure of the dates here) - but it is a trend that lasted as long as the current, and has a similar slope. 3) Negative response from cloud cover 4) They invoke trends longer than we have had decent instrumentation that account for some of the warming. These folks acknowledge that first order CO2 forcing. They question the extent of negative feedbacks. While the balance of evidence and logic seem to support AGW - I sometimes think people are "cherry picking" the easy/dumbest things the true deniers say, and lumping all questions about the logic and science in with the low quality points - leaving some valid counter-arguments unexamined. -
RSVP at 17:46 PM on 13 June 2010How climate skeptics mislead
It is not the amount of data that makes a theory true. For centuries people believed that the Earth was flat based on a multitude of "evidence". Data on its own does not lead to the truth and can be very misleading indeed if applied to a false hypothesis. And as long as alternative theories are not openly discussed, we are all that much poorer. Furthermore, the comment about false readings taken from weather stations due to air conditioners, carparks and parking lots is a strawman if there ever was one. -
Paul D at 17:32 PM on 13 June 2010Is the long-term trend in CO2 caused by warming of the oceans?
I'm thinking that it might be useful to grade 'fingerprints' into primary and secondary (or more) classes? So that a secondary fingerprint is dependent on a primary fingerprint for its validity? eg. on it's own a secondary fingerprint may not indicate a specific scenario, but in a broader sense does in this case indicate increasing CO2 emissions from a source. -
chris at 17:11 PM on 13 June 2010Monckton Chronicles Part IV– Medieval Warm Period?
Passing Wind at 15:15 PM on 12 June, 2010”Abraham is using this devise to deflect the fact that Monckton accurately cited paper about regarding the MWP and to paint Monckton as dishonest for not having contacted them.”
But we’ve already seen that Monckton hasn’t “accurately cited paper about regarding the MWP” (sic). That’s the point isn’t it Passing Wind? If you’re going to cite something is support of an assertion the cited article should properly support that interpretation.”Anyone writing an academic paper is entitled to take a written work as it stands. Even if they are claiminbg the earth is flat. If this were not the case, people could publish anything they wanted, then claim you misrepresented them for quoting it because they have changed their mind, or the opinion they expressed is no longer the "company line".
That’s an astonishing misrepresentation of ethical and honest scientific communication. If one makes a specific statement [“….. the Medieval Warm Period was real, was global, and was warmer than the present. That is the scientific consensus…”], then the papers one cites in support of this statement must be an honest depiction of the state of the relevant science. It’s simply unacceptable to choose old papers that seem to support a position without considering subsequent work, or to pretend that a tiny set of papers that doesn’t represent the “scientific consensus”, does. Ignorance (and contrived ignorance) is no excuse whatsoever. Assessing the evidence properly is always done by those that try to communicate the science. If you're uncertain of the relevance of a paper in the context of the field you look at the set of papers that later cite it. There are scientific databases for this; alternatively you use Google Scholar. That way you establish whether the paper has remained valid and properly represents the issue being addressed. Everyone who attempts an honest communication of the science does this. For scientists and honest communicators it’s second nature, and it's simply not possible to do or communicate science otherwise. Not doing so is cheating and an insult to one’s audience. Your understanding of basic issues of scientific ethics seems to be askew on this..... -
caerbannog at 16:54 PM on 13 June 2010How climate skeptics mislead
(From 12 above) #11 David Horton at 11:26 AM on 13 June, 2010 how do I explain that to the glaciers? No need to explain them, they are not sentient. Just filter out soot from smoke. And the satellites. What about the satellite MSU data? Soot problems there, too? -
caerbannog at 16:49 PM on 13 June 2010How climate skeptics mislead
Regarding the "global warming is caused by air conditioning" meme mentioned above... ...It should be noted that many air conditioners function as heat pumps during the winter. So it would seem to me that thermometers located near air-conditioning/heat-pump exhaust outlets should demonstrate, on average, a "cold bias" during the winter months. Has anyone involved with the surfacestations project considered this? -
Philippe Chantreau at 16:33 PM on 13 June 2010How climate skeptics mislead
BP, that blog post from Spencer seems to be only a blog post. Is it published? If not, why not? Considering it is not open for comments, it is conveniently shielding itself from even "blog review." If that's all there is to it, I am unimpressed. What does real science say about UHI and how it's dealt with in the data? Doesn't SkS have a post on that, linking real science papers? Why would it deserve less credence than Spencer's? How much scrutiny have you applied (as a genuine skeptic would) to this blog post? As much as you do to so-called "pro-AGW" peer-reviewed science articles? You cite it but do not provide any kind of critical analysis, where is your skepticism? What exactly is the "warm bias" on the graph and how is it calculated? How does this explain the SST increase? Thingadonta has a very wordy post that equally fails to impress me. Skeptics are concerned with exaggeration eh? What does one find on skeptic blogs? Stuff like this: http://wattsupwiththat.com/2010/05/25/the-western-snowpack-is-137-of-normal/ Averaging percentages, without giving it much thought. Talk about exaggeration. How convenient. What would happen if so-called "pro-AGW" serious sites like RC did the same kind of abysmally stupid maths? Oh, the uproar. But, of course, that's never going to happen because the standards are different on RC. And this is just one in a long history icluding carbonic snow, and what not. What a joke. But there is more. What do we find in that thread? uncritical rants. How many "skeptics" apply their skepticism to the o.p.? I counted 2 before deciding that, since I have only one life to live, filling even a tiny amount of my time with the kind of stupidity found there could be a mortal sin. It's not like I don't have better things to do. They just go on ranting about how much snow they had this winter. Where is the subtantive discussion on data? Why is none of the regulars there addressing the stupid maths? Why is nobody saying tha the 137% figure is misleading? On the 2008 science blog of the year? That's what GW skepticism is, mostly (I should say overwhelmingly). I'm as unimpressed as ever. The worst part of it, and the one that applies even to the better quality skeptic contributors here, is the double standard. One-sided skepticism is no skepticism at all. Especially when it has mouthfuls of "bias" to spray on everybody. I'll just keep looking at what real scientists, doing real work, publish. I can't understand a lot of it, and it certainly isn't perfect. Yet it is still a better use of my time than "skeptic" internet stuff like the Spencer's post you linked. -
caerbannog at 16:17 PM on 13 June 2010Is the long-term trend in CO2 caused by warming of the oceans?
Gallopingcamel, give it up, for the following reasons: 1) We know how much carbon has been burned by human activity over the past few decades, and if all the carbon-dioxide produced had remained in the atmosphere, atmospheric CO2 levels would be much higher than they are now. So we *know* that the external environment (oceans, soils, etc) have acted as a net carbon *sink*, not a source. This is straightforward middle-school arithmetic. 2) The falling pH of the oceans indicates that the oceans have been *absorbing*, not releasing, CO2. This is straightforward freshman chemistry. Consult almost any freshman college chemistry textbook for more details about this. 3) Atmospheric O2 concentrations have been falling (not enough to cause any problems, but enough to measure), and they have fallen in a manner completely consistent with the amount of fossil-fuels burned by humans. 4) C14/C12 ratios up to 1950 (beginning of atmospheric testing) track human fossil-fuel use up to that date very nicely. Even with C14 contamination due to nuclear testing, the C14/C12 ratio over time gives us plenty of evidence that humans have put lots of fossil-fuel carbon into the atmosphere. After atmospheric nuclear testing ceased, the C14/C12 ratio began declining from the "nuclear testing spike" in a manner consistent with fossil-fuel combustion. We have plenty of C14/C12 data preceding and following atmospheric nuclear testing to show that humans were dumping lots of fossil-fuel carbon into the atmosphere. So like I said, gallopingcamel, just give it up. Or better yet, sign up for an introductory Earth-science course at your local community college instead of wasting your time (and your brain cells) on Anthony Watts idiocy. -
citizenschallenge at 15:13 PM on 13 June 2010How climate skeptics mislead
penguindreams I really like how you explained that so I'm going to repeat it (the rest of your post also made sense.) ~ ~ ~ ~ ~ ~ ~ at 09:50 AM on 13 June, 2010 I like E. O. Wilson's term consilience. Evidence converges towards one conclusion from a wide variety of directions. Any given line (every line) has some possibilities for error. But those possibilities and routes of error are different between the different lines. There is consilience between lines of evidence as wildly different as sea level, global thermometer networks, and the times of flowers blooming in the spring. (And many, many, more.) They all have sources of error, but each source of error could as easily point to cooling as warming. Yet there is consilience that the earth is warming. -
Sean A at 15:04 PM on 13 June 2010How climate skeptics mislead
thingadonta, it doesn't seem like you understand how science works. Bias gets filtered out. Results are independently replicated and verified&mdash if they're not, they get tossed out. Good scientists are highly skeptical and put ideas "through the wringer" before *cautiously* starting to accept them as possible, provisional descriptions of reality. Nothing is ever "settled" in science, if new data comes along, or a better explanation that fits the data, the old ideas get tossed out the window. What you've described is nothing like science. Science is not about "consensus building". That sounds like politics, or simply personal opinion. The IPCC is decidedly conservative. Their conclusions are toned down, not exaggerated. -
citizenschallenge at 15:02 PM on 13 June 2010How climate skeptics mislead
MattJ #1 You are doing the scientists a disservice - it is not like they are the ones that located those weather stations. There were other entities doing that and many of those station were established before global climate became a central issue. Another red herring! ~ ~ ~~ ~ ~ ~ The scientist worked with the data available to them - -
monckhausen at 14:50 PM on 13 June 2010How climate skeptics mislead
Skeptics do mislead. That's a real oxymoron - a very kind labelling of somebody who cheats but expects people like us and the scientists to play by the rules. Derek, FoGT -
Sean A at 14:44 PM on 13 June 2010How climate skeptics mislead
We've got multiple, independent sources of temperature data, both surface and satellite based, that are in pretty good agreement. Objectively, the trend is significant warming. So can we at least agree that global warming is real? -
Sean A at 13:30 PM on 13 June 2010Is the long-term trend in CO2 caused by warming of the oceans?
gallopingcamel #40, there are 3 different articles on RC, including that one, that explain how we know that the increase in CO2 is due to fossil fuel burning. Isotope ratios are just part of it. From direct measurements, the amount of CO2 in the oceans is increasing. -
thingadonta at 13:30 PM on 13 June 2010How climate skeptics mislead
Your argument still misses the point. Skeptics are primarily concerned about exageration. Even the more extreme skeptics concede that c02 causes warming, the question is how much (negative /positive feedbacks), and that necessarily means exageration on various levels is a key issue. They key quesiton is overall climate sensitivity, and urban surface temperatures, for example, are being used to bolster up higher climate sensitivity estimates and formulate policy. Urban heat islands are not melting glaciers, but skeptics contend that glaciers are melting largely naturally, and superficially enhanced urban surface temperatures are being used to falsely bolster the case for higher climate sensitivity. There is another isuse skeptics are concerned about which your arguemnt doesn't mention or understand in the slightest. I would call it a 'manufactured' or 'superficial consensus'. Now before you stop reading, this doesnt mean conspiracy, it is simply human bias, or noble cause corruption. Some people's basic philosophical position is to bring 'order' and 'consensus' to a chaotic world, but skeptics contend this can be a dangerous or two-sided basic philosophical foundation, because inconsistency and disorder (chaos) is a fundamental principle of both nature and society, which means it is very easy for a 'manufactured consensus' to ignore the scientific reality (change/disoder/chaos). Skeptics contend that 'manufactured consensus' goes on all the time, and is very dfficult to eliminate, as in "The Hithchikers Guide to the Galaxy" when two war lords are at the table and one of them mutters something which turns out to be offensive to the other's mother without realising it, and all out war in unleashed. It happens (almost) without intent. Skeptics contend that claiming a 'consensus of evidence' with current climate data is a form of noble cause distortion/corruption. Whenever something crops up which doensn't fit the model, some research is carried out which inevitably comes up with an angle which 'makes' it fit, but in many cases such a 'fit' is entirely ambiguous. The bandwagon followers then proclaim, 'it turns out that is supports strong AGW etc etc', when the data makes no such conclusion. Skeptics contend this happens frequently. Therefore, there is no 'consenus of evidence', and overall climate sensitivity is still rightly debated. People in other fields such as anthrolopolgy and physics understand this process a bit better it seems. No one claims that 'dark matter' for example is a given because the data is still ambiguous. Anthrolopoloigsts consistenly find bones of hominids exactly fitting the model they were trying to prove, until somone finds another set of bones which leads to a different interpretation. They accept this sort of human bias, but they dont want to change the economy because of it. Becuase of this frequent distortion of 'consensus', skeptics are always trying to pick holes and weaknesses in the arguments, which is entirely reasonable given the process of human bias above. But your argument suggests all such is misguided. We should trust the funding and peer review process, the scientists. I think the diasgreements come from a different perspective of basic human nature, and a learned lack of faith in the current peer review process. I'll give some concrete examples, off the top of my head. There is no evidence that volcanism was stronger in the Cretaceous and that is why the c02 levels were higher and T was warmer. It is a superficial consensus focred to fit into the 'model'. Possibilities ignored include continental configuration and changes to ocean currents. There is no evidence that oceans acidified dramatically fast during mass extinction events and coral reefs collapsed in short periods of time, the process appears to be very slow, meaning we don't know how ocean chemistry responds to very short term c02 rises. Evidence ignored includes the oceans not diverging more than 0.6pH in the last 300 million years, which implies they are strongly buffered to c02 changes (eg dissolution/precipitaiton of carbonate sediments in the subsurface, which is larger in area than all the worlds coastal shelfs). To say that coral reefs will 'become eroding structures in 30 years' by ignoring this sort of doubt is simply following a constantly manufactured consensus. I am not using these examples as particually good examples of underlying doubts, just examples of where ambiguous data is made/manufactured to fit into a general model. It goes on all the time. We dont know cloud cover during the Little Ice Age or the MWP and how this affected T. We dont know overall climate sensitvity. Many other examples could be given. Skeptics will continue to focus on small pieces, big pieces, the big picture and the small picture, for as long as there is human bias, and until we have very strong confidence in overall climate sensivity, which even the politically charged, 'we exagerate for political reasons' IPCC, is unsure about. -
ProfMandia at 13:17 PM on 13 June 2010How climate skeptics mislead
Berényi Péter: How much has the population grown over the oceans? Must be a lot of UHI there because T trends over those regions are pretty close to those over land. Why does this dead horse keeping trying to get up? Scott A. Mandia, Professor of Physical Sciences Selden, NY My Global Warming Blog -
mothincarnate at 12:10 PM on 13 June 2010How climate skeptics mislead
That's more or less my general argument; that there are so many lines of evidence and impacts that the argument of AGW is pointless, meaningless and provokes inaction in the face of so many issues. One thing that I'd like to say, however; I wouldn't say that "species are becoming extinct". More accurate would be to say that current extinction rates are being further exaggerated by climate change. We know that our land change use is already having a massive impact on biodiversity, but with climate change impacting on distribution (tending to shift further from the equator) and ecological cues (ie. first bloom, nesting etc), this is having a detrimental effect on species and community fitness. Then acidification of surface waters... These are happening, regardless of the first comment here "not much warming is left" of which I'm happy to provide a list of papers. Cheers, Tim -
Uncle Pete at 12:10 PM on 13 June 2010How climate skeptics mislead
Actually air conditioners do at least contribute to global warming, as most of them are in the US and they suck up untold Megawatts of electric power , which in turn is mainly generated by coalfired powerstations. :) -
Berényi Péter at 11:31 AM on 13 June 2010How climate skeptics mislead
#11 David Horton at 11:26 AM on 13 June, 2010 how do I explain that to the glaciers? No need to explain them, they are not sentient. Just filter out soot from smoke. -
David Horton at 11:26 AM on 13 June 2010How climate skeptics mislead
"Not much warming is left. " Phew, there's a relief. But how do I explain that to the glaciers? -
Berényi Péter at 11:15 AM on 13 June 2010How climate skeptics mislead
#6 Dan at 10:04 AM on 13 June, 2010 It is hard to worry much about "sloppy" surface data No, it is not hard. Just criticism is largely misplaced.
The Global Average Urban Heat Island Effect in 2000 Estimated from Station Temperatures and Population Density Data
by Roy W. Spencer, Ph. D.
You can see, as UHI is roughly proportional to the logarithm of population density, the problem gets really serious only with stations in the least densely populated areas.
UHI effect is roughly logarithmic with
ΔT = 0.23×log(0.66×d)
where d is local population density per km2.
As global population density between 1900 and 2008 has increased fourfold, in first approximation this effect alone can explain about a 0.23×log(4) ~ 0.32°C increase in global average surface temperature during this period as measured by meteorological stations.
However, as relative abundance of stations flagged rural in GHCN has increased recently, the actual figure must be higher (because at low population density the curve is steeper).
Not much warming is left.
-
Marcus at 11:08 AM on 13 June 2010How climate skeptics mislead
@ Dan (post #7). I think This video really highlights the point you're making about people padding their resumes to make themselves sound more credible on this issue. Like the guy says (ok, so I'm paraphrasing here)-"would you go see a GP to get brain surgery done? NO-then why do we trust weathermen or Classics Graduates for their OPINIONS on climate change?" -
Marcus at 10:56 AM on 13 June 2010Monckton Chronicles Part IV– Medieval Warm Period?
No, PW, Monckton's presentations are loaded with FALSEHOODS-not errors. He KNOWS that what he is presenting is WRONG, but continues to give the presentations anyway. Just look at his initial reaction to Abraham's criticisms-he refused to admit a single error (even the obvious ones) & instead focused on ad-hominem attacks of Abraham (all the while demanding a level of respect that he has failed to show to others-the HYPOCRITE). Compare that to Abraham's very calm & measured rebuttal of Monckton, & its all too easy to see who the con-man is, & who the genuine scientist, following correct lines of inquiry, is-its just a shame that you can't figure it out. For the record, I personally don't like Al Gore that much, but his presentation in "An Inconvenient Truth" was not filled with the deliberate lies & misrepresentations that Monckton uses. Indeed, his documentary involves interviews with the *actual* scientists in the field-something Monckton would *never* do, because he KNOWS they won't support his outlandish claims. Also, I've yet to hear Gore attack his detractors in the same venomous, ad-hominem way that Monckton attacks his detractors. You also hilariously claim that if people want to believe Monckton's lies, then that's *their* business. Yet when those people who choose to believe him control our ability to take action to reduce the world's Greenhouse Gas emissions, I'd say it actually becomes *everyone's* business. Your assertion is akin to saying "oh sure that cult leader is encouraging his flock to commit murder, based on his misrepresentation of the bible, but it's *their* right to believe him". What complete & errant nonsense. So I applaud Abraham's efforts in debunking Monckton, because then maybe more people will treat his message with a little more *genuine* skepticism. However, when I read the posts of people like yourself, PW, who desperately try to defend Monckton-even after all his LIES are laid bare-I realise that some people who are only "skeptical" when it suits their interests. Lastly, in spite of your claim above, its obvious to anyone reading that you have a VENDETTA against Abraham because he has attacked your beloved Monckton. From the moment you started commenting on these posts, you've shown a barely restrained HATRED of Abraham-using the most pedantic things to attack his credibility on-whilst letting Monckton completely off the hook. Again, this makes me doubt your self-proclaimed "neutrality" in this matter-a view I'll continue to hold until you can provide something approaching GENUINE PROOF that Abraham has deliberately sought to mislead his audience. -
Tenney Naumer at 10:49 AM on 13 June 2010How climate skeptics mislead
This is an excellent post because it is both clear and succinct. -
scaddenp at 10:30 AM on 13 June 2010Increasing CO2 has little to no effect
TOP - because H2O is FEEDBACK. Any forcing,= that raises the temperature of atmosphere will increase the water content and thus the GHG effect from it. If you want to know about the FORCING due to increase in anthropogenic gases then you need to filter out the feedback. -
Dan at 10:20 AM on 13 June 2010How climate skeptics mislead
Keep up the good work. You're doing a great service. By the way, another common method (this is not news, I'm sure) by which climate skeptics mislead is by bluffing credentials and experience. It is as effective as twisting facts, but safer, because they are rarely challenged. People are too busy and too aware of their own lack of science training to find out things. It is usually fairly effective to believe an expert. So, self-appointed climate rebels who feel that AGW is all a hoax spend a fair bit of their argument with falsehoods about their own positions as "renowned" scientists, the smartest and the first, etc., when the opposite is usually true. The British have a good word for it: puffery. A complete nobody in climate science can look into the TV camera and say "I am one of the few people qualified to speak about climate change", and people believe the next malarkey that comes out of his mouth. Amazing. The deniers get away with arguing from (falsely attributed) authority because the future of the planet is not important enough for the rest of us to challenge personal claims. That could be embarrassing. -
TOP at 10:05 AM on 13 June 2010Increasing CO2 has little to no effect
Curious but when showing changes in absorbtion of infrared why is the contribution from H2O always filtered out? It would seem to me that this would become more positive as the atmosphere warms. -
Dan at 10:04 AM on 13 June 2010How climate skeptics mislead
It is hard to worry much about "sloppy" surface data weather collection when we see results like this: http://www.skepticalscience.com/Is-the-US-Surface-Temperature-Record-Reliable.html Quote: "The work of surfacestations.org is useful in clarifying one point - microsite influence has imparted little to no warming bias in the U.S. temperature record." -
villabolo at 09:59 AM on 13 June 2010How climate skeptics mislead
John Cook says: "Skeptics claim thermometers are unreliable because surroundings can influence the reading. They reinforce this by showing photo after photo of weather stations positioned near warming influences like air conditioners, barbeques and carparks. The Skeptics Handbook goes so far as to say "the main 'cause' of global warming is air conditioners"." I remember in grade school seeing a wall unit air conditioner running full blast on a hot summer day with a shimmering appearance right outside the window that gave the impression of something rising up right from behind the A/C. That was the hot air exhaust. The fact is that hot air rises immediately, not after it travels 20 or more feet horizontally to swirl around the thermometer. -
penguindreams at 09:50 AM on 13 June 2010How climate skeptics mislead
I like E. O. Wilson's term consilience. Evidence converges towards one conclusion from a wide variety of directions. Any given line (every line) has some possibilities for error. But those possibilities and routes of error are different between the different lines. There is consilience between lines of evidence as wildly different as sea level, global thermometer networks, and the times of flowers blooming in the spring. (And many, many, more.) They all have sources of error, but each source of error could as easily point to cooling as warming. Yet there is consilience that the earth is warming. mattj: I haven't read a lot of the 19th century literature about collecting surface air temperatures and sea surface temperatures, but some. I think it's quite a stretch to condemn people 100 years ago for not having collected their data in ways that we in 2010 wish they would have. If you read their work, they were clearly trying to collect the best possible observations, in the best possible way, as they understood it at the time, and for the purposes they were collecting the data at the time. 30, 70, 130 years later, we're trying to do different things with the data, in different ways. That's our problem. Calling them 'sloppy' for not anticipating our interests and methods doesn't strike me as fair to anybody, or useful for anything.
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