Am I Anti-Science?

I promise, cross my heart, this is my last post on climate change for a while.  I thought my series of posts last week about the funny math of carbon offsets was the last, but Joe Miller at Catallarchy wrote something that caused me some introspection:

Just one caveat, though: I'm really, seriously, profoundly uninterested
in your skepticism about man-made global warming. Personally, I think
that the debate is just about as fruitful as a discussion of the
relative merits of evolution and Genesis as models of the origins of
the universe. It's called scientific consensus, people. You seem to
like it well enough for every other subject. And even if that
overwhelming scientific consensus turns out to be wrong, it's not like
a debate here is going to help with that. When scientists are wrong,
it's up to, you know, like, other actual scientists to settle
the question. A bunch of non-scientists googling studies that say what
we like them to say isn't accomplishing much, really.

Certainly I have always been in favor of facts and science over hysteria.  I criticized the rampant breast implant litigation in the face of science that showed no real long-term harms.  Ditto vaccinations.  So am I being a Luddite by, as an amateur, being skeptical of the scientific "consensus" on global warming?  Certainly climate change hawks want to paint my positions as "holocaust denial."  I had a few thoughts:

  • For what it is worth, I have actually read much of the 2001 IPCC climate report (not the management summary, which is a worthless political document, but the report itself).  Courtesy of, who has posted some of the 2007 report, I have read key parts of that report as well.  So I have at least informed myself beyond random Google searches.  My original university training was as a scientist, and later an engineer, though neither in climate (physics and mechanical engineering).
  • The media has been known to declare a consensus ahead of its actual existence.  One example that comes to mind is a recent letter that a number of economists wrote supporting a Federal minimum wage increase, which much of the media spun into a "consensus" among economists that a minimum wage increase would be desirable and would not reduce employment.  I don't know Mr. Miller, but my bet is that some of the folks at Catallarchy might dispute this particular scientific consensus.
  • To even imply that there is a single consensus on something as complex and multi-faceted as anthropomorphic global warming is facile.  I will take the movie "An Inconvenient Truth" as a fair representation of what the media perception of the consensus is  (the IPCC report actually does not agree in full, but we will get there in a minute).  Taking that movie as our straw man, the "consensus" or hypothesis is as follows:
  1. The world has been warming for a century, and this warming is beyond any historical cycles we have seen over 1000 years  (ie, the hockey stick)
  2. The last century's warming is almost all due to man's burning of fossil fuels and other releases of greenhouse gasses
  3. In the next 100 years, CO2 produced by man will cause a lot more warming
  4. Positive feedbacks in the climate, like increased humidity, will act to triple the warming from CO2
  5. The bad effects of warming greatly outweigh the positive effects, and we are already seeing them today (polar bears dying, glaciers melting, etc)
  6. These bad effects, or even a small risk of them, easily justify massive intervention today in reducing economic activity and greenhouse gas production

I believe this is a mostly fair representation of the media reporting of the scientific "consensus", with the exception that the media never really goes into step #4, and assigns all the blame for 6-8 degree temperature rise forecasts to CO2.  But this split between #3 and #4 is important to understand the science at all, and is included in the IPCC report, so I will make it. 

This is a complicated string of logic, with multiple assumptions.  I hope you see why declaring a scientific consensus on all points of this hypothesis is facile.  So where is there a scientific consensus on all of this?  My interpretation from the recent IPCC report and other sources is:

  1. The world has been warming for a century, and this warming is beyond
    any historical cycles we have seen over 1000 years  (ie, the hockey
    There is a strong consensus on the first half.  We can argue about urban heat island corrections and ground vs. satellite all day, but the earth has pretty clearly warmed for a hundred years or so, after cooling before that.  The second half of the proposition is trickier.  The 2001 report relied on the Mann hockey stick to make the point that the 20th century is not just warmer but uniquely warmer.  I sense the 2007 report backing off this -- the Mann analysis has a lot of problems, and ongoing climate research continues to point to the great variability and cyclicallity of climate over time.  There is too much historical evidence, for example, of a warm middle ages for Mann to dismiss it with a few tree rings.
  2. The last century's warming is almost all due to man's burning of fossil fuels and other releases of greenhouse gasses.   The 2001 IPCC report implied about half of the century's warming was man-made.  The new report seems to put more of the blame on man.  My sense is this will move over time back to half and half -- the evidence today of increased solar activity is becoming too strong to ignore as a cause along with man-made CO2.  However, I recognize right now that I am out of step with the IPCC and perhaps the "consensus" on this.
  3. In the next 100 years, CO2 produced by man will cause a lot more warming.  CO2 production by man will cause more warming.  How much is the subject of models, which any economist or businessperson can tell you are notoriously flaky.  However, here is one fact that is part of the scientific consensus but you never hear in the media -- the relationship between atmospheric CO2 concentration and warming is a diminishing return.  In other words, the next doubling of CO2 in the atmosphere will have less impact on temperatures than the last doubling.  At some point, the effect of CO2 maxes out, and further increases in CO2 have no effect on temperatures.  My reading of the newest IPCC seems to imply that if the models predict about 6 degrees of warming over the next 100 years, of which about 2 is directly from CO2, while the rest are from positive feedbacks (discussed next)
  4. Positive feedbacks in the climate, like increased humidity, will act to triple the warming from CO2.  OK, this strikes me as the key point in the scientific consensus.  Hypothesized positive feedback loops in the climate are what take the IPCC models from results that are warmer but probably manageable to results that appear catastrophically warmer.  Their models assume that as the world warms a bit from CO2, other effects take hold, and the world will warm even more.  For example, they posit that if the world is warmer, more water evaporates into water vapor in the atmosphere, which is a strong greenhouse gas, which accelerates the warming.  I think it is absurd to say there is a consensus on this point, which is adding 2/3 or more of the warming.  The notion of positive feedbacks in nature offends my intuition --  there are just not that many such processes in nature, or else nothing would be stable -- but then again Einstein's intution was offended by quantum mechanics and he was wrong.  However, using the IPCC's own findings (starting in section 8.6 here) the IPCC admits to there not even being a consensus on the sign (ie if it is positive or negative feedback) of what they describe as by far the strongest feedback process (cloud cover)!  I don't know how you can declare a consensus if you admit you don't even know the sign of the largest effect.
  5. The bad effects of warming greatly outweigh the positive effects,
    and we are already seeing them today (polar bears dying, glaciers
    melting, etc) 
    It would be absurd to declare a consensus here because no one has really done much definitive work.   Most folks, including me, presume that since substantial warming would take us beyond the temperature range for which our bodies and our civilization has been adapted, the net effect would be bad.  But there are positive offsets to the negative effects (e.g. oceans rising) that you never really hear about in the press (longer growing season, for one) but which are in the IPCC report.  Climate scientists themselves have admitted there is no consensus on what effects that we are seeing today are due to warming.  Part of Antarctica (about 2%) shown in Al Gore's movie is warming, but most scientists now think that this may be due to cyclical variations in ocean currents, while most of Antarctica has actually been cooling of late.  Greenland is warming, but glaciers may not be receding as fast as once feared.  Polar bear populations, despite reports to the contrary, are increasing.
  6. These bad effects, or even a small risk of them, easily justify
    massive intervention today in reducing economic activity and greenhouse
    gas production. 
    Many climate scientists express an opinion on this, often definitively, but if one argues that I am not qualified to test the consensus as a layman on global warming, then certainly climate scientists are far from qualified in drawing any conclusions on this topic.  The effects of a worldwide rollback on CO2 production at current technologies could be catastrophic, particularly for a billion people in India and China just on the verge of emerging from poverty.  Even in some of the most dire forecasts for warming, it is a very open question with little consensus as to whether a cooler but poorer world is better.  In fact, one can argue that even the pious Kyoto-signing countries are voting with their actions, rather than their words, on this issue, since they have resisted taking the hard economic steps necessary to meet their targets.

OK, that is more than I meant to write.  My point is that the word consensus is an absurd word to apply to the topic of anthropomorphic global warming.  Some things we understand pretty well (the world is warming, in part due to man-made CO2) and some we understand less well (the effect of feedback loops).  And some issues, like whether the harms from climate change are worth the cost of avoiding them, are entirely outside the purview of climate science.

Update: Strata-Sphere has a funny bit of related snark:

Global warming on Neptune's moon Triton as well as Jupiter and Pluto, and now Mars has some scratching their heads over what could possibly be in common with the warming of all these planets....

I still don't know. Could there be something in common with all the
planets in our solar system that might cause them all to warm at the
same time?

On a serious note, he has some nifty graphs of historic earth temperature reconstructions (including Mann) vs. sunspot activity reconstructions (sunspot activity generally being a proxy for solar output).  Short answer:  Sunspot activity at historical highs, at the same time as historical highs in temperature. 


  1. TJIT:

    A relevant comment from another coyote, this one at a dog show:-)

    if we look at the geological record, we see that the climate changes of the last 1000 years -- both warmer and colder, wetter and drier -- are more radical than most anything the global warming alarmists are predicting. Look at the last 15,000 years and you've got an ice age with a mile-deep sheet of ice covering most of North America north of the 40th parallel, and a millenium-long drought that had open blowing sand extending from western Wyoming to central Nebraska. None of that climate change can be realistically attributed to anthropogenic causes.

    When I first heard the discussion on Global Warming (now known as "climate change" because it is not falsifiable)I thought what is the big deal it has been going on long before man arrived on the scene.

    Over the years it has become obvious that the reason it is so popular is because it gives the usual suspects an enormous amount of power to do what the usual suspects like to do. That is create massive government programs that will likely end up doing more harm then good.

    Furthermore, the actions the usual suspects want to take are likely to seriously degrade our ability to respond to the next event of real, non-anthropogenic climate change.

    A disturbing number of the global warming proponents have a very strong inquisition mind set. They don't like their theology of scientific consensus carefully managed by their priestly actual scientists to be questioned. Heretics (I mean climate change deniers) face much abuse from the keepers of the true climate faith.

  2. Bill:

    I think TJIT is on to something. And, the IPCC report largely ignores the evidence from astronomy...Gore and company don't want to deal with the significant body of evidence that the other planets are warming also.

    Looks to me like there is a much better data fit with solar activity than anything else, but so far no one has been willing to turn on the fiscal tap in this naturally the herd goes where the money is.

  3. ArtD0dger:

    Absolutely. In the long run, humans (if we are to survive on Earth) will need to learn to nudge the climate just like we will need to learn to nudge the orbits of Earth-colliding asteroids. None of this Ghia-worship Luddite stuff holds any hope of that.

    Um, would "anthropomorphic global warming" be global warming that talks back?

  4. Jeff Smithpeters:

    Absent global warming, there's more than enough reason already to reduce CO2 and other emissions and reduce the consumption of fossil fuels.

    Perhaps the increasing rate of children with asthma in the past 20-30 years is enough reason on its own if you really do prefer to help people rather than short-term business interests.

  5. Bob Smith:

    Air quality throughout the US, especially in urban areas like Los Angeles, is higher than it was in the 50s and 60s, yet asthma rates are higher. I conclude pollution doesn't cause asthma.

  6. May:

    Great dialog on this post! I agree with TJIT's comment regarding the unfortunate political/media interpretation of "global warming". The specific ideas proposed in the theory of climate change are however, falsifiable as is any theory accepted in the scientific community. I think that scientists need to engage themselves in both research and the political process, so the general public can expect accountability from politicians. There is an initiative at Scientists and Engineers for America. I found this website helpful and (relatively) unbiased.

  7. TCO:

    Steve McIntyre has written hundreds of blog posts with assertions or "possibilities" or "scratch padding" of errors. He has only published one real article in a real science journal (the GRL letter). And that was 2 years ago. In addition, he has been tendentious in responding (and may have even been misleading in original intent in his GRL article) to Huybers, who showed very nicely how he conflated a change in centering with a change in standard deviation dividing. Pretty weak, in my mind.

  8. JW:

    Now, why would that giant ball of fusing hydrogen have anything to do with our climate? That's just silly.

  9. Glenn B:

    As far as what Joe Miller had to say, why doesn't he say just that to Al Gore, and tell him to shut up. makes as much sense as it did telling you, maybe even more.

  10. DirtCrashr:

    The IPCC is a political entity operating at the whim and command of the UN - as economist and President Vaclav Klaus of the Czech Republic has pointed out. Accurate chemical CO2 gas analysis of air over 180 years show a different trend compared to the literature of IPCC climate change actually published.
    "Accurate measurements had been done amongst others by de Saussure 1826, Pettenkofer/v.Gilm 1857, Schulze 1864/71, Farsky 1874, Uffelmann 1886, Letts und Blake 1897, Krogh and Haldane 1904, Benedict 1912, Lundegardh 1920, van Slyke 1929, Dürst and Kreutz 1934 alternatively 1940, Misra 1942 or Scholander 1946 with measuring instruments through which from 1857 (Pettenkofer) an accuracy of +/-0,0006 Vol% to under +/-0,0003 Vol% =3 ppm (Lundegardh 1926) was achieved. These pioneers of chemistry, biology, botany, medicine and physiology constituted the modern knowledge of metabolism, nutrition science, biochemistry and ecology. Modern climatology ignored their work till today even
    though it is the basis of all textbooks of the mentioned faculties and was honoured with several Nobel prizes. In total over 90 000 measurements within nearly every year since 180 year gave the following results:
    1. There is no constant exponential rising CO2 -concentration since preindustrial times but a varying CO2-content of air following the climate. E.G. around 1940 there was a maximum of CO2 of at least 420 ppm, before 1875 there was also a maximum.
    2. Historical air analysis by chemical means do not prove a preindustrial CO2 -concentration of 285 ppm (IPCC),as modern climatology postulates. In contrast the average in the 19th century in northern hemisphere is 321 ppm and in the 20th century 338ppm.
    3. Todays CO2 value of. 380 ppm, which is considered as threatening has been known several times in the last 200 years, in the 20 th century around 1942 and before 1870 in the 19th century. The maximum CO2 -concentration in the 20th century roses to over 420 pmm in 1942."

    It's not a consensus - and consensus isn't how Science works. Check out the rebuttals: Dipl. Biol. Ernst-Georg Beck, Merian-Schule Freiburg, 8/200

  11. TCO:

    Show me the peer-reviewed papers. Don't get too excited about the work of advocates. That can be a dry hole (on the anti-warmer side).

  12. Mike:

    If you haven't seen it yet, watch The Global Warming Swindle, a BBC documentary on the subject. It is VERY exhaustive in the subject matter it covers.

  13. DirtCrashr:

    The demand for "consensus" to prevails strikes me as much more than something of a scientific coming-together (kum-bah-yah), but as a demand for Solidarity.