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Dikran Marsupial at 02:39 AM on 7 March 2013Carbon Dioxide the Dominant Control on Global Temperature and Sea Level Over the Last 40 Million Years
laughinchance - a lot of the change in temperature was caused by CO2 and CO2 changes lag temperature changes by 800+ years. There is no contradiction there, it is just what you would expect if the natural carbon cycle provided positive feedback amplifying the effects of orbital variation.
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DSL at 02:31 AM on 7 March 2013Carbon Dioxide the Dominant Control on Global Temperature and Sea Level Over the Last 40 Million Years
Yes, they did. Now, what does it mean to you?
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LaughinChance at 02:26 AM on 7 March 2013Carbon Dioxide the Dominant Control on Global Temperature and Sea Level Over the Last 40 Million Years
Curiously the British Court that defended Al Gore's film found the opposite to be true...
Among the inaccuracies was this:The film suggests that evidence from ice cores proves that rising CO2 causes temperature increases over 650,000 years. The Court found that the film was misleading: over that period the rises in CO2 lagged behind the temperature rises by 800-2000 years.
http://www.globalwarminghoax.com/news.php?extend.29 (among numerous citations!)
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Rob Honeycutt at 02:25 AM on 7 March 2013Carbon Dioxide the Dominant Control on Global Temperature and Sea Level Over the Last 40 Million Years
BillEverett said... 'I am unhappy with Ally's calling CO2 simply earth's main control knob."
Actually, Dr Alley calls CO2 the "Biggest Control Knob." That would be very different than saying it's the "main" control knob.
I have somewhat of an enhanced version of this analogy. You can maybe think of the whole system as a very complex and sloppy set of gears and pulleys. A forcing is something like solar variation or orbital changes that are actively turning one or more of the gears, and those gears are in turn driving a broad series of other gears and pulleys. Each of those turns at different rates and has a net effect on global temp. CO2 happens to be just one of the cogs in the system that has the largest effect on global temp. Even when a separate forcing is doing the work, that forcing is pushing the "big knob" (CO2) to have the largest effect.
The difference today is, we are directly moving that CO2 knob ourselves. It's still a sloppy system of gears and pulleys, and thus there is some delay in the net effect, as well as uncertainties with what the exact effect will be. But there is no doubt, based on our understanding of how the system works, that we're fiddling with the big knob.
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CBDunkerson at 01:52 AM on 7 March 2013Carbon Dioxide the Dominant Control on Global Temperature and Sea Level Over the Last 40 Million Years
Kevin, yes in the past CO2 levels have naturally gone up to ~280 ppm, dropped down to ~180 ppm, and repeated over and over again.
You ask, "Why won't it happen again?"
We're at ~400 ppm CO2 and climbing. Completely outside the bounds of that 'natural cycle'. The natural ~100 ppm CO2 drop from that cycle would normally occur over the course of next few tens of thousands of years... we have already increased CO2 by more than that 100 ppm and are still putting enough in to offset the entire decline every fifty years.
So, basically... the phase of the Milankovitch cycle which in the past has caused CO2 levels to drop will 'happen again'. It will just be insignificant in comparison to the rate at which we are increasing CO2 levels.
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Dikran Marsupial at 01:43 AM on 7 March 2013Carbon Dioxide the Dominant Control on Global Temperature and Sea Level Over the Last 40 Million Years
Kevin, the ice ages are generally understood to be initiated by changes in the Earth's orbit (i.e. Milankovic cycles), which explains the regularity (point 1). Note very carefully that I said "initiated", rather than "caused". This is because the changes in insolation caused by the variation in orbit is not sufficient to cause the observed change in the Earths temperature, so we know that there must be some feedback mechanism that amplifies the effect of the Milankovic cycles.
One of these feedback mechanisms is the carbon cycle. As the world warms up, the oceans release CO2 into the atmosphere, which is a greenhouse gas, which causes a bit more warming, so a bit more CO2 is released and so on. Fortunately there are also negative feedbacks (principally the Stefan-Boltzman law), so this process doesn't continue forever.
Now before we go onto more advanced issues, please can you explicitly state whether you agree with this, and if you don't agree, please explain why not.
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CBDunkerson at 01:32 AM on 7 March 2013Carbon Dioxide the Dominant Control on Global Temperature and Sea Level Over the Last 40 Million Years
I've been looking at sea level rise maps. At 24 meters Bangladesh and the Netherlands essentially cease to exist... along with various island nations, the U.S. state of Delaware, half of Florida, and most of the major cities on the planet. We'd better hope this study is wrong, actual rise is on the low end of the uncertainty range, or the timescale is in the thousands of years, because even a 'several hundred years' timescale for this kind of sea level rise could be economically devastating.
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Kevin8233 at 01:28 AM on 7 March 2013Carbon Dioxide the Dominant Control on Global Temperature and Sea Level Over the Last 40 Million Years
shoymore,
There are others, and more recent, but it doesn't much matter.
dr2chase,
all well and good. Except for the fact that the glaciation graphs tend to be saw toothed in shape, not sinusoidal.
1. What causes this regularity? With the built in pauses?
2. More importantly, what causes the sharp drop off? Both CO2 and sea level drop rather drastically. Apparently, this is natural, as it repeatedly happens again and again. Why won't it happen again?
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dr2chase at 01:05 AM on 7 March 2013Carbon Dioxide the Dominant Control on Global Temperature and Sea Level Over the Last 40 Million Years
I'll have a shot at explainging this to Kevin. The climate has two positive feedback mechanisms of (usually, hopefully) limited range -- albedo, and greenhouse gasses. Shrinking ice sheets increase heat absorption leads to more shrinking ice sheets leads to more heat absorption -- but they cannot shrink past zero. There appears to be a mechanism where increase GHGs (CO2 and CH4) lead to increased warmth leads to increased GHGs -- perhaps because of reduced solubility in the ocean, perhaps because of methane hydrate releases.
The initial kick that usually leads to change, either cooling or heating, does not need to be large -- if it is large enough to push either feedback mechanism into action, the feedback takes over, and then the change (ahem) snowballs. This is why, in the case of the natural warming out of ice ages, you see the CO2 lagging the change -- the initial kick out of equilibrium is not large, and precedes the first increase in CO2. But that first increase in CO2 leads to more warming -- which precedes the next increase in CO2. And the next increase leads to more warming, etc. This is consistent both with (1) the lag you see written about and (2) claims that CO2 is the cause of most of the warming. You might argue that really this is all about ice caps and albedo, and that would be reasonable, except that we already know that CO2 is a greenhouse gas of no small power (else we would not be here to have this discussion, because the planet would be far colder, even colder than it is during ice ages).
The reason, now, that we see CO2 rises not lagging temperature increases is because the CO2 increase is both artificial and rapid -- the earth (in particular, the oceans) are slow to warm, and we have also outrun any historically observed feedback effects.
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John Hartz at 00:48 AM on 7 March 20132013 SkS Weekly Digest #9
Doug Hutchenson:
You can access a profile of Judith Curry at Source Watch by clicking here.
I presume that Curry is not included in the SkS Misinformers section because updating that section has not been a particlarly high priority activity for members of the SkS volunteer author team. I would also note that neither DeSmog Blog nor Real Climate have posted a profile of Curry.
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Physicist-retired at 00:03 AM on 7 March 2013China Takes a Leading Role in Solving Climate Change
JoeT,
Your links provide some meaningful information, and are much appreciated.
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Composer99 at 23:03 PM on 6 March 2013Carbon Dioxide the Dominant Control on Global Temperature and Sea Level Over the Last 40 Million Years
BillEverett:
With regards to your point (1), if memory serves (it has been some time since I have watched the video), I do not recall Alley referring to CO2 as a control knob in his speech (although it is referred to as such in the title of the presentation).
He does, I am much more certain, note that the combination of volcanic CO2 emissions and rock weathering of CO2, taken together, regulate the climate in a manner similar to a thermostat (the word 'thermostat' or some synonym is used).
Since the term 'control knob' is used prominently in the title of the presentation, your criticism still stands, as far as I can see.
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BillEverett at 19:49 PM on 6 March 2013Carbon Dioxide the Dominant Control on Global Temperature and Sea Level Over the Last 40 Million Years
A few points (in addition to seconding or thirding the Tom Curtis motion@19):
1. I am unhappy with Ally's calling CO2 simply earth's main control knob. We encounter lots of control knobs in our everyday lives (or at least we used to in the predominantly analog era): volume control knob, screen brightness control knob, etc. These control knobs work virtually instantaneously. We have had very few control knobs that take significant time to see the effect of turning the knob. The most common examples (perhaps the only examples familiar to most people) is a thermostat: the thermostat for controlling home temperature, the thermostat in the refrigerator, the thermostat for the oven in the kitchen. I wish Ally had originally called CO2 earth's main thermostat.
2. In the older Antarctic ice core data, while CO2 lagged temperature, CH4 was leading by more than CO2 was lagging. With the recent indication that the relative age of the air bubbles and the surrounding ice in the Antarctic core data need adjusting, the CH4 lead would increase as the CO2 lag decreases. As is known, CH4 is converted to CO2 and H2O in the atmosphere on the time scale of a decade. Both CH4 and H2O are greenhouse gases, but their residence times in the atmosphere are relatively short. The residence time of CO2 is on the order of a millenium, which is why it is the main greenhouse gas for long-term climate control.
3. The atmospheric CO2 concentration does not directly control the sea level. Sea level is controlled by the amount of water in the oceans and the temperature of that water (water expands when it warms). When water is stored on land as ice, that water is not running quickly to the sea.. The causal chain is thus: high atmospheric CO2 results in increased temperature, which means warmer oceans and less land ice (more water ran into the sea), and consequently a higher sea level. On the other hand, low atmospheric CO2 results in decreased temperature, which means cooler oceans and more land ice, and consequently a lower sea level.
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shoyemore at 18:39 PM on 6 March 2013Carbon Dioxide the Dominant Control on Global Temperature and Sea Level Over the Last 40 Million Years
Kevin #12,
The paper you cite was published in 1999.
I suggest it has been superseded by these papers published much more recently:
http://www.nature.com/nature/journal/v484/n7392/full/nature10915.html
http://www.sciencemag.org/content/339/6123/1060.abstract
From the second:
Here we propose a revised relative age scale for the concentration of atmospheric CO2 and Antarctic temperature for the last deglacial warming, using data from five Antarctic ice cores. We infer the phasing between CO2 concentration and Antarctic temperature at four times when their trends change abruptly. We find no significant asynchrony between them, indicating that Antarctic temperature did not begin to rise hundreds of years before the concentration of atmospheric CO2, as has been suggested by earlier studies.
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Doug Hutcheson at 18:35 PM on 6 March 2013China Takes a Leading Role in Solving Climate Change
China is taking climate change seriously
That's good to know. May it long continue.
Is the Australian reduction in carbon emissions from the electricity sector and energy demand legitimately able to be sheeted home to the Carbon Tax, or are there other factors in play? (Good news if it is due to the tax.)
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Doug Hutcheson at 18:20 PM on 6 March 20132013 SkS Weekly Digest #9
I was looking for material on Judith Curry, to counter a comment in another forum, but she does not appear on the 'Climate Misinformers' page (unless I have misread). Any reason for her absence from the rouges' gallery?
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Doug Bostrom at 18:00 PM on 6 March 2013China Takes a Leading Role in Solving Climate Change
Further to PluviAL, in the past half-dozen years China has equipped homes with 20GWE+ of domestic solar hot water, the equivalent of 10 of the largest nuclear plants crisply instantiated as facts on the ground. Here in the US we pretty much ignore this ridiculously easy to obtain energy, apparently preferring instead to dream and talk about a resurgence of nuclear power when fraction of the money required to realize our romance with atom splitting could actually solve problems for us immediately. Not to say we shouldn't split atoms, just that we frequently let imaginary perfection be the enemy of factual good enough.
Indeed, China doesn't "just talk about it."
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KR at 16:08 PM on 6 March 2013Reality Drop - using social media to rapidly respond to climate misinformation
As a not unexpected note, WUWT has blocked links from Reality Drop, insofar as they can, using the URL origin.
Apparently WUWT's best response to critiques based on peer-reviewed literature is to stick their fingers in their ears, sing "la la la", and ignore them. That's just sad.
Disengaging from discussion, ignoring other points of view, blocking dissention - I seem to recall complaints from the 'skeptics' on just those items. "Emulating the Enemy", or at least the perception of the enemy, perhaps?
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PluviAL at 15:57 PM on 6 March 2013China Takes a Leading Role in Solving Climate Change
Habilus: I have been to China extensively. In less than 6 years they built the largest High-Speed rail road network in the world. When China sets out to do something they do it, they don't just talk about it. Your comment makes me think the rest of your comments are just as pooly based. That the air is dirty is not a question, so it is a straw man argument on your part. Do you work for the pollution company interests?
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Bob Loblaw at 14:42 PM on 6 March 2013Temp record is unreliable
..and furthermore...
Air temperature measurements were not started with the monitoring of climate in mind. The concept of "climate" probably didn't even exist in those terms until after people started accumulating data. As experience accumulated, methods of measuring temperature improved (and changes need to be accounted for in looking at long-term trends).
Even though historical air temperature records are an incomplete view of historical global conditions, they are useful. Extensive land surface air temperature records go back much further than ocean temperature records. We understand many of the linkages between ocean and land temperatures, and we can account for much of the differences in patterns. AIr temperatures are but one part of the jigsaw puzzle, but they do help.
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scaddenp at 14:13 PM on 6 March 2013Temp record is unreliable
Further to DSL
2- no it is absolutely not a simple average. First "global average temperature" is tough to define (and measure) so what is usually calculated is global average anomaly. Second, all the temperature records use area weighting. However, there is a lot of differences in the detail (and a lot of detail). The advanced section of this article gives you good pointers for more information.
3- Any proxy of use has to have two attributes - a way to tell the time accurately and a way to tell the temperature. The best long term proxy is ice core bubbles. The "lock in" time for a bubble is short and where you have annual snow layers, you have very good clock. Thermometry is also very good compared to most other proxies. Resolution degrades as you go back in time for all proxies. Ice core gets you 600Ka but only for very selected places on earth (greenland and Antarctica). Spelothems are prob next best as far as I know but more problematic for absolute dating and thermometry but wider global coverage. Going back beyond these you lose time resolution badly as you become dependent on radiometric dating resolution. Resolution will depend on the particular technique. In something like benthic forams from marine cores you can good relative time but not absolute time (and a lot of fun interpreting the thermometry).
In short all proxies have issues of one sort or another and paleoclimate studies are best within integrating multiple lines of evidence.Go to http://www.ncdc.noaa.gov/paleo/recons.html for data but read metadata about limitations before leaping to any wild conclusions.
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DSL at 13:41 PM on 6 March 2013Temp record is unreliable
grindupBaker,
1. Public interface. The thermal capacity of the oceans is difficult to explain to the general public, and surface temp is "in your face."
2. Hansen 2010; HadCRU; BEST
3. I'll defer to others.
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Phil L at 13:34 PM on 6 March 2013Reality Drop - using social media to rapidly respond to climate misinformation
brent @ 17, my apolgies for missing the tongue-in-cheek nature of your comment. I agree that Michael Mann's book is a masterpiece, and I'm a big fan of Mark Twain. My use of the term "your ideology" was unwarranted - I mistakenly thought you were dismissing Spurgeon as a citation because of the fact that he was a Baptist preacher, not because of his current obscurity. To me it's a simple question of who said it first, no matter how famous or obscure that person was.
"People misquote me on the Internet all the time. Please cut that sh1t out" -Albert Einstein
But I realize this discussion has strayed off topic .... Reality Drop looks like a useful tool with potential to complement SkS's carefully researched articles.
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jyyh at 13:32 PM on 6 March 2013Carbon Dioxide the Dominant Control on Global Temperature and Sea Level Over the Last 40 Million Years
What Tom Curtis said: Seconded. While it's good to debunk denialist articles individually too, the continous stream of crap, illogical presentations and outright lies by the usual suspects may effect also good sites. Luckily, the article refuting Goddard etc. types usually contain their name on the headline so I can skip the article. I mean, I have decided their originals (and comments therein) aren't worth the bandwith, but still someone might still believe then so the debunkings should continue, however frustrating it is. I'd like to call it 'The propaganda-machine of deniers', but I'm still not certain, they might just be assholes having fun at the expense of future generations. (oops, off topic, please delete.)
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grindupBaker at 13:30 PM on 6 March 2013Temp record is unreliable
I have 3 questions (1) Since oceans store same heat per ~20' depth as all air & all land that's relevant (to ~20' depth) why is avg global temp being used rather than ocean heat energy in the graphs publicly discussed ? (2) Is avg global temp a simple avg of all readings, or weighted ? (3) Can I find a proxy historical global temp set (600Ka ? 600Ma ?) to fine time resolution - a millenium ? a century ?). Anybody ?
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Philippe Chantreau at 12:13 PM on 6 March 2013Why SkS withdrew from the Bloggies
Nice Kr :-) Nothing like real data analysis, something that Watts took years to do and when he did he couldn't acknowledge the results. Not surprising since the results invalidated the very initial premise of his site's existence. Nuff said
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KR at 11:54 AM on 6 March 2013Why SkS withdrew from the Bloggies
Doug Bostrom - Less than 1:20 rated as good. Hmm, that seems to indicate a 2-sigma significance result, that "good" is not supported by the evidence for that blog source.
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Riduna at 11:42 AM on 6 March 2013‘Frozen Dirt’ and Methane … ‘We Cannot Go There’
The essay ignores the elephant in the room – methane trapped in clathrate and as gas in surrounding sediments beneath permafrost covering the seabed of the Siberian Continental Shelf. This has been quantified by Shakhova and Semiletov as comprising not less than 1,700 gigatonnes. As a result of seabed permafrost degradation methane has been observed venting to the atmosphere. Because of the shallow depth of water covering the continental shelf, it has no time to oxidize to far less potent CO2.
Continuing loss of sea ice and Arctic Ocean warming, combined with atmospheric warming is likely to result in accelerated loss of seabed permafrost, increasing venting of methane to the atmosphere. This has the potential to reduce sub-seabed pressure, destabilise shallow clathrates, rapidly increasing methane excursions from them to the atmosphere, further amplifying Arctic temperatures and chnaging global climate.
Daniel Bailey rightly observes that “the Kraken does not yet wake... “ But it is already stirring and nothing short of reversing Arctic warming is likely to prevent it (methane) from venting to the atmosphere in such volume as to bring about rapid and permanent climate change before 2100.
Do I hear mutterings about geo-engineering – spraying sulphides at the top of the stratosphere - to prevent this? The clothing industry could produce a whole new range that can withstand acid rain and we could all get on with business as usual.
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Tom Curtis at 11:16 AM on 6 March 2013Carbon Dioxide the Dominant Control on Global Temperature and Sea Level Over the Last 40 Million Years
First, I want to commend Rob Painting on an excellent article. I particularly appreciated the clear statement of the basis for the conclusions, along with the relevant caveats. Could a link to this article be placed at the bottom of the various sea level myth rebutals so that it is not lost in the continuous stream of posts at SkS, and left to languish in obscurity.
In particular, a link would be appropriate on these pages:
How much is sea level rising; and
Why Greenland's ice loss matters.
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Tom Curtis at 11:09 AM on 6 March 2013Why SkS withdrew from the Bloggies
1) Eclectikus makes a variety of claims about Richard Feynman's views on pseudo-science, but does not quote a source for those claims. Google searching, I have found two discussions of pseudoscience by Feynman available on the net. The first, and more substantive, only refers to pseudoscience in the introductory comment which was not part of the actual lecture. In the lecture itself, he only refers to "cargo cult science", a term which is definitely pejorative. Clearly Feynman considers "cargo cult science" and "pseudoscience" to be the same thing.
The distinction between cargo cult science and real science turns out to be a kind of scientific integrity. Feynman describes it as follows:
"... It is interesting, therefore, to bring [the distinction between cargo cult science and real science] out now and speak of it explicitly. It's a kind of scientific integrity, a principle of scientific thought that corresponds to a kind of utter honesty--a kind of leaning over backwards. For example, if you're doing an experiment, you should report everything that you think might make it invalid--not only what you think is right about it: other causes that could possibly explain your results; and things you thought of that you've eliminated by some other experiment, and how they worked--to make sure the other fellow can tell they have been eliminated.
Details that could throw doubt on your interpretation must be given, if you know them. You must do the best you can--if you know anything at all wrong, or possibly wrong--to explain it. If you make a theory, for example, and advertise it, or put it out, then you must also put down all the facts that disagree with it, as well as those that agree with it. There is also a more subtle problem. When you have put a lot of ideas together to make an elaborate theory, you want to make sure, when explaining what it fits, that those things it fits are not just the things that gave you the idea for the theory; but that the finished theory makes something else come out right, in addition.
In summary, the idea is to give all of the information to help others to judge the value of your contribution; not just the information that leads to judgement in one particular direction or another."
(Quoted from here.)
Let's be very direct about this. A cherry picker does not "... give all of the information to help others to judge the value of your contribution". Somebody who does not calculate the predictions of their theory does not "... give all of the information to help others to judge the value of your contribution". Somebody whose account of the science contradicts itself does not "... give all of the information to help others to judge the value of your contribution".
Therefore, by Feynman's definition there is no doubt that the Coleman article is "cargo cult science", ie, pseudoscience.
Eclecticus can disagree with that assessment if he likes, but he cannot honestly do so while quoting Feynman as his authority. If he disagrees, he owes us his own definition of "pseudoscience", and he needs to justify it with rational argument - something he appears unprepared to do.
It should be noted that one person falling below this ideal does not make a discipline pseudoscience. Science is a self correcting communal activity. Individual scientists are human, and like most humans tend to protect favoured theories from criticism to some extent. But the scientific community as a whole, particularly the scientist's peers in the discipline will not be so slack. In this respect, climate science is clearly scientific; whereas the AGW "skeptical" movement is astonishingly reticent in criticizing even the most absurd ideas, provided they would make taking action against global warming, if true. The political effect of those theories clearly outways, in their minds, any commitment to scientific integrity. That, and perhaps, a fear that if they are too open in exposing the fallacies of their fellow travellors, their fellow travellors might return the favour.
2) It was well said by some ancient sage, and recorded in the Tanakh that,
That was said while books where still written by hand on parchment. You can imagine that sage's distress if confronted with the internet.
The point is that, even if we confine ourselves to scientific papers (for example), there is far more material produced than any one person could hope to read, let alone analyse and understand. To cope with modern flood of information, we need spam filters.
As noted, this applies even in science. That is the purpose of peer review, which is supposed to weed out papers that are obviously poorly supported or simply wrong. Peer review does not pretend, and cannot hope, to eliminate all errors from scientific papers. But it does aim to ensure that any errors that make it through to publication are either subtle, ie, not easy to find, or interesting, ie, to show that they are errors you need to learn something new.
A good science blog should also be a spam filter. It should weed out the pseudoscience, and the misleadingly presented. It should present only posts which are reasonable summaries of the science, which are interesting, and encourage people to learn critical thinking rather than gullibility.
By this standard Skeptical Science is a good science blog.
By this standard, WUWT is the antithesis of a good science blog. It does not weed out the bad articles, such as that by Coleman. It certainly does not encourage critical thinking, but instead teaches gullibility. The same can be said of all four remaining short listed nominees for the best science award at the blogees.
Regardless of what definition Eclectikus contrives to maintain his belief that WUWT is a good science blog, the fact remains that as a spam filter to filter out bad science and bad reasoning, WUWT fails abysmally. Indeed, it works more to filter out good science and good reasoning rather than the reverse.
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Doug Bostrom at 10:44 AM on 6 March 2013Why SkS withdrew from the Bloggies
Eclectikus: 93.- doug_bostrom, some of them only support a reading diagonal, maybe, but "WUWT" is not specifically a divulgative blog like this, and this has to be in the reader's mind.
Twenty articles and not a single one you're prepared to unreservedly endorse as "good?" Having nothing more specific to work with I take it thereby that when you say "I've also read good articles at WUWT" you mean some proportion fewer than 1:20 are "good" by your own estimation.
Perhaps if I'd provided a larger sample (50?) we'd learn something more about the "good versus something else" ratio. As it stands, some proportion less than 1/20th useful is not an impressive record. But that's not necessarily the end of the story; it's still possible that you could identify which of the sample consisting of the last twenty climate science related articles at WUWT strike you as good.
Unfortunately even if 1:10 articles or even 1:5 articles at WUWT prove to be worthwhile we're still seeing confirmation of John Cook's original point of his blog post.
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Leto at 10:43 AM on 6 March 2013Why SkS withdrew from the Bloggies
Eclectikus@106. The definition did not seem to come up in that video - unless I missed it. But it doesn't matter where the definition came from - the way you have applied the definition is invalid, even if the definition had some merit in another context, with the appropriate caveats in place.
It would be reasonable to characterise as "pseudoscience" a discipline that was unable to explain any empirical data or produce any empircal predicitons. On the other hand, it would be ludicrous to characterise a discipline as pseudoscience simply because it failed to explain all empirical data, or had a few unknowns, like physiology and climatology.
So, are you saying that climate science is pseudoscience in the same way that physiology is pseudoscience?
And, while we are on the topic, how would denialist climate theory stack up against the requirement that it must have explanatory and predictive power to be considered science? What empircal data is better explained by a denialist than by consensus climate science? Even cherry-picked snatches of noise do not get explained by any of these guys, just pointed out - with the statistical sophistication of an astrologist. The latest effort at WUWT includes drawing a fat yellow horizontal line over an uplsoping trend of ocean-heat content and calling it a pause in global warming, a challenge to AGW. How is that not pseudoscience, by any definiton?
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Composer99 at 10:33 AM on 6 March 2013China Takes a Leading Role in Solving Climate Change
Habilus:
I am fairly certain this is the third time today I have noted that someone has misunderstood the ad hominem fallacy. Tom Curtis & I were both rather pert with you, that is true. However, we also addressed the substance of your claim (insofar as there was any to begin with). We would have committed the fallacy only if our responses had solely been our concluding remarks.
(Interestingly, I came across this essay while looking for a concise definition to use above which argues that there is no ad hominem fallacy.)
I still don't see where the problem with Australia losing out on carbon ETS (to be accurate) revenue is, insofar as it results from Australian individuals, families, and businesses reducing their carbon usage more aggressively than the government projected. And as Tom Curtis notes, the Australian government diverts the ETS revenue into payments to Australians to offset cost increases from the scheme. So if the ETS generates less revenue than generated, I suppose that less money would be paid out - but this would balance out as reduced carbon usage by Austalian individuals, families and businesses means they are not affected as much by costs passed downstream by emitters.
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scaddenp at 10:13 AM on 6 March 2013Why SkS withdrew from the Bloggies
Hmm, Weart is great account of the historical background. SoD "insigificant trace gas" series is great introduction to basic physics, but for overview of science, it's hard to beat the IPCC WG1 report.
There is no talk of "closing blogs" - how could you? But if you are interested in scientific truth as opposed to ideology-driven anti-science why would bother to read sites that misinform? (and I would hasten to add that Spenser and Curry arent in the sewer with WUWT). The usual reason is to seek confirmation of what you hope is true. A science education is about training the mind on how not to fool yourself.
Discussion on models belongs in the "Models are unreliable" thread. However, there are some caveats to observe when thinking about GCM models. While purposes overlap, there are two reasons for creating computer models. We could be realising well-established conceptual models for a useful purpose (eg tomorrows weather or plotting a probe to Hyperion). Or we could be testing our conceptual models by checking computation against observation. GCMs are used for both but differences in intent change what is actually done. In both cases, comparisions or predictions have to be made against uncertainties inherent in both the computations from the models and in the measurements of the real world. This leads to very different levels of robustness about predictions. In evaluating models, it often better to think of model skill (performance of model predictions compared to null hypothesis). Current GCMs have no skill at decadal level prediction for instance. They have considerable skill in many other areas.
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Philippe Chantreau at 09:45 AM on 6 March 2013Why SkS withdrew from the Bloggies
I will stop comparing climate science with Quantum theory if you stop making meaningless arguments about the "age" of an area of science.
Your "endemic problem" is BS. Fake skeptics' theories are mutually exclusive ("i.e. it's the sun" and "climate sensitivity is low") and have no grounding in reality. They're made up according to the need of the moment. Nothing follows in the litterature that is worth considering. In an effort of your own rethoric, youonly cite various wordings of what is the same thing, without showing that the thing was any different. I'm unimpressed. As for the "snowfalls are a thing of the past", I have never seen any such statement from a source that is worth reading. Considering the enormity of it, please provide a source.
Watts' problem is not one of communication, it's one of incompetence:
http://wattsupwiththat.com/2009/06/09/co2-condensation-in-antarctica-at-113f/
Not only did they give this much serious consideration, but the peanut gallery in the comment thread keeps on ridiculing the people trying to inject some sense in the discussion, the kind who could understand the phase diagram. That's a legitimate source to you? Really?
I still go read these posts when I need a good laugh. In subsequent ones they do little high school experiments and eventually conclude "it seemed like a good idea at the time."
Now please explain to me how these buffoons add quality to any kind of debate about science. Goddard was described by Smokey as writing "informative posts."
Eventually Watts had to distance himself from Goddard's incompetence in an effort to keep up appearances. That's too bad, it was more entertaining when he was on. board...
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Bob Loblaw at 09:32 AM on 6 March 2013Why SkS withdrew from the Bloggies
Eclectikus:
You've bought into Judith Currie's "uncertainty monster", and unfortunately you don't have the knowledge to recognize it for what it is (which is not much). The sources you are using are seriously overblowing the significance of the uncertainties.
You've been asking about sources summarizing climate science. I suggest you try reading Spencer Weart's The Discovery of Global Warming.
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keithpickering at 09:28 AM on 6 March 2013Carbon Dioxide the Dominant Control on Global Temperature and Sea Level Over the Last 40 Million Years
The .pdf link is dead to me, and no cache is available. The supplemental info and data are available at the PNAS website.
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uknowispeaksense at 09:15 AM on 6 March 2013China Takes a Leading Role in Solving Climate Change
However, opposition leader Tony Abbott has said that the election in September of this year is a "referendum on the carbon tax," and at the moment he appears to have a lead in the polls. So far the impact of the carbon tax on the Australian economy appears to be minor, as expected, while both carbon emissions from the electricity sector and energy demand have fallen recently. In short, the carbon tax is working well, but there are worrying signs that it may nevertheless be repealed as a result of the upcoming election.
I initially examined Hansard, which is the record for the Australian parliament, personal websites, interview transcripts and press releases looking for definitive statements by every current member of both houses of parliament that demonstrate their individual positions on the science underpinning climate change. Links to both pages can be found here. I also extended that to look more closely at Tony Abbott's shadow cabinet team and it doesn't look very good for any environmental policy should his party be successful in the federal election in September. That page is here. That said, my understanding is that Abbott will find it very difficult to repeal the carbon tax given the effort big business, the traditional conservative support base, has put in to accommodate it in their business plans. Much work has also gone in to their long term future planning also. It will be too messy. Abbott and his team will spin it however they see fit to backflip on the promise to repeal, knowing the electorate has a short memory.
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uknowispeaksense at 09:10 AM on 6 March 2013China Takes a Leading Role in Solving Climate Change
However, opposition leader Tony Abbott has said that the election in September of this year is a "referendum on the carbon tax," and at the moment he appears to have a lead in the polls. So far the impact of the carbon tax on the Australian economy appears to be minor, as expected, while both carbon emissions from the electricity sector and energy demand have fallen recently. In short, the carbon tax is working well, but there are worrying signs that it may nevertheless be repealed as a result of the upcoming election.
I initially examined Hansard, which is the record for the Australian parliament, personal websites, interview transcripts and press releases looking for definitive statements by every current member of both houses of parliament that demonstrate their individual positions on the science underpinning climate change. Links to both pages can be found here. I also extended that to look more closely at Tony Abbott's shadow cabinet team and it doesn't look very good for any environmental policy should his party be successful in the federal election in September. That page is here. That said, my understanding is that Abbott will find it very difficult to repeal the carbon tax given the effort big business, the traditional conservative support base, has put in to accommodate it in their business plans. Much work has also gone in to their long term future planning also. It will be too messy. Abbott and his team will spin it however they see fit to backflip on the promise to repeal, knowing the electorate has a short memory.
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Eclectikus at 08:56 AM on 6 March 2013Why SkS withdrew from the Bloggies
Sphaerica #103, you understand what you want understand. I read WUWT, and when I do I know what I read. I also read SkS, SoD, Climate Audit, Roy Spencer, Curry, and some more. Are you claiming to close all blogs except SkS and realClimate?
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Eclectikus at 08:50 AM on 6 March 2013Why SkS withdrew from the Bloggies
104 # Leto. Please take a look the video I posted in #43, and you'll see where I take this "weird definition".
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Eclectikus at 08:40 AM on 6 March 2013Why SkS withdrew from the Bloggies
Thank you scaddenp, I take note and I probably come back with some questions in different areas I have, basically about confidence in models and on several sources of uncertainties recognized by NASA itself: http://climate.nasa.gov/uncertainties/
In order to be reasonably informed in a particular issue, reading the papers in the journals is a excesive time consumer, for my is more easy go to selected works pointed out here or there, and reading what people more engaged have to say on particular threads in several blogs. I think is a very good option that Internet offers to all of us, people no directly implicated on Climatology. I read often Roy Spencer (and also Steve McIntyre), less Real Climate, and I didn't know about Issac Held... bookmarked, you see? always is possible to get something clean. Thanks.
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Leto at 08:35 AM on 6 March 2013Why SkS withdrew from the Bloggies
Eclectikus wrote:
"In Feynman's sense, theories that are unable to explain empirical values, and in this sense (and only in this sense) Climatology could be tagged as pseudoscientific."
I am often struck by the parallels between climatology and medicine. Both deal with imperfect data and complex systems. Both have to make predictions and recommend solutions without the luxury of waiting for perfect information and a complete theory that will never come. Both have to fend off attacks by fringe theorists who claim to know better than those who have actually done the hard yards and, you know, studied the subject. And, of course, both are "pseudoscence" by your weird definition. This suggests your definition is not very useful.
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Bob Lacatena at 08:10 AM on 6 March 2013Why SkS withdrew from the Bloggies
Eclectikus,
...we're far to have a working model of the earth climate.
False. This is one of the denier's mantras. "We don't know enough!"
B.S. Go read. I already told you, you don't actually understand enough of the science to adopt the position that you have. But rather than learn more, you claim to know everything you need to know, and supplement your ignorance by reading WUWT.
For shame.
I really do not understand why it is so hard to accept this position... is there any other coherent position?
That's because you don't understand the science, so you read all sorts of emotional (and false) nonsense that you see on B.S. sites like WUWT. The foundation of your position — that climate science is weak, that the IPCC is corrupt, even that there is some sort of debate about the science itself — is undermined by reality. You can't see that, though, because instead of educating yourself, you come here to pontificate, or go to WUWT to get even more confused about the state of the science.
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JoeT at 07:43 AM on 6 March 2013China Takes a Leading Role in Solving Climate Change
Further to my post @19, Pierrehumbert says his views are in line with those of Larry Cathles. Here's an article about the Cathles/Howarth argument. Also, here is the published paper.
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dhogaza at 07:29 AM on 6 March 2013Carbon Dioxide the Dominant Control on Global Temperature and Sea Level Over the Last 40 Million Years
Kevin:
"This is a peer reviewed paper showing that CO2 lags behind temp."
And this, much more recent, just published in Science, shows that actually it hardly does at all:
Parrenin, F. V. Masson-Delmotte, P. Köhler, D. Raynaud, D. Paillard, J. Schwander, C. Barbante, A. Landais, A. Wegner and J. Jouzel, 'Synchronous changes of atmospheric CO₂ and Antarctic temperature during the last deglacial warming', Science, 339, 1060-1063, 2013.
It would be a good paper for SkS to write about.
Kevin, regarding the whole Milankovic cycles, CO2 feedback, etc, this is all so 1990s denialist argumentation that has been undermined by climate science for a very long time. The paper I cite above compresses the time scale in which CO2 rises as a result of Milankovich-cycle forcing causing the earth to warm, which emphasizes that this rise leads to a feedback affect accelerating that warming.
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Chris Colose at 07:26 AM on 6 March 2013Carbon Dioxide the Dominant Control on Global Temperature and Sea Level Over the Last 40 Million Years
There's several points of confusion in the above comments, most of which miss the timescales being discussed in the paper, which (by and large) is a bit longer than orbital. From a last ~60 million year perspective, CO2 is pretty clearly a big forcer of the gradual cooling we've seen over the Cenozoic and in the development of the great ice sheets. You can say it's a "geologic feedback" in the sense that the CO2 responds to things like plate tectonics, mountain uplift, rate of organic carbon burial, etc However you define a reference system, you can call something a feedback, but it doesn't change the physics that we don't have a way to get from the climate 60 million years ago to the climate today without changing the CO2. On the glacial-interglacial timescales, you have to be careful, because the orbit is pretty clearly pacing the changes and the impact of CO2 becomes progressively more important as you move equatorward (e.g., in the CMIP5 models for example there is a more coherent negative correlation between model climate sensitivities and their tropical averaged LGM temperature anomalies, as opposed to the global mean anomalies...it doesn't really matter in this sense whether the orbit or the CO2 comes first, radiation still works...but the CO2 pretty clearly comes after Antarctic changes but before global-mean changes). But the ice sheet changes can't be tied to just CO2, so I wouldn't out much stock in the paper on orbital timescales.
On the geologic timescales when you sample over lots of orbits, you still have to be careful applying the results from the paleo-record to the future, because there's almost certainly hysteresis in the ice sheets (e.g., whatever concentration of CO2 helped you glaciate Antarctica is almost certainly a different concentration of CO2 than you need to deglaciate Antarctica) and the rate of change probably matters too. Some of these issues aren't well-sampled given the time resolution and (rather one-way) temperature evolution over the last 40 million years.
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DSL at 07:13 AM on 6 March 2013Carbon Dioxide the Dominant Control on Global Temperature and Sea Level Over the Last 40 Million Years
Should I repeat the concept for a fourth of fifth time? CO2 is CO2. It doesn't matter how it gets into the atmosphere. If we put it there, it is considered a forcing. If it gets there through ocean warming, it is considered a feedback. That whole "CO2 lags temp" meme is one of the goofiest.
And, again (because you did not read what I wrote the first time), orbital forcing starts the glaciation/deglaciation process. Once the process begins, the initial orbital forcing is overwhelmed by feedbacks. The primary feedbacks are, for glaciation, increasing ice/snow-albedo effect and decreasing ocean temp (increase in CO2 uptake). The primary feedbacks for deglaciation are warming oceans (decrease in CO2 uptake) and decreasing ice/snow albedo effect. Both processes are modified slightly by, respectively, associated changes in the biosphere (respectively, a decrease in biosphere uptake of CO2 and an increase in biosphere uptake of CO2). Water vapor is a fast feedback and so doesn't enter into the conversation about climate-scale forcings and feedbacks.
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Composer99 at 07:05 AM on 6 March 2013Carbon Dioxide the Dominant Control on Global Temperature and Sea Level Over the Last 40 Million Years
Kevin:
CO2 lagging temperature applies where its emission by sources or absorption by sinks is temperature-dependent: CO2 emission from or absorption by the oceans, CO2 absorption by rock weathering, and similar processes.
By contrast, CO2 leads temperature when its emission by sources is temperature-independent, such as emissions from volcanism (which has been a trigger for past warming, if not in the Pleistocene) and, since the start of the Industrial Revolution, the massive bolus of fossil carbon emitted by humans. (I am not personally aware of any temperature-independent carbon sinks, although perhaps the kinds of biological sinks that lead to the creation of fossil fuels count.)
The correlation between sea level and CO2 is unsurprising because either the small orbital forcing (as in the Pleistocene) is magnified by the greenhouse effect, allowing sea levels to rise or fall in tandem with CO2 concentrations, or (as in the modern period, or perhaps warming out of Snowball Earth conditions when temperature-dependent absorption of CO2 is inhibited while vocanic emission continues apace) because CO2 emissions are driving both temperature changes and sea level changes.
As far as I can see, the paper you link to explains in published form exactly what I was describing in #10. If you wish to pursue further discussion along the lines of "CO2 lags temperatures" I suggest this thread.
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ubrew12 at 06:56 AM on 6 March 2013Carbon Dioxide the Dominant Control on Global Temperature and Sea Level Over the Last 40 Million Years
A control knob is not a switch. Alley is saying if you can control CO2, orbital effects will have little effect. Go ahead and throw the switch, if the oven is turned down little is going to happen. The mechanism whereby CO2 drives temperature can be proven in your garage. The mechanism whereby temperature drives CO2 is speculative, involving ocean outgassing. I believe it and so do you, but if you're going to get hung-up on causation, that should be your candidate. Once CO2 levels increase, temp and sea level have little choice but to respond in kind, because of that thing you can prove in your garage. So the lag you notice is evidence of a different switch, but the response has little choice but to reflect the control knob. That the control knob can also be a switch shouldn't be hard to imagine. In the last 150 years, thats been the case.
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