Coyote Blog

I am often told, in emails that vary from friendly to downright threatening, that global warming science is not scientific consensus and my skepticism puts me on par with tobacco company lobbyists.  An upcoming paper in Theoretical and Applied Climatology looks back at a recent peer-reviewed Nature article that purported to provide more evidence for man-made global warming and found the much quoted article by Isabel Chiune in Nature to be complete crap:

What is important here is not the truth or falsity of
the assertion of Chuine et al. about Burgundy temperatures. Rather,
what is important is that a paper on what is arguably the world's most
important scientific topic (global warming) was published in the
world's most prestigious scientific journal with essentially no
checking of the work prior to publication.

Moreover "” and crucially "” this lack of checking is not the result
of some fluke failures in the publication process. Rather, it is common
for researchers to submit papers without supporting data, and it is
frequent that peer reviewers do not have the requisite mathematical or
statistical skills needed to check the work (medical sciences
excepted). In other words, the publication of the work of Chuine et al.
was due to systemic problems in the scientific publication process.

The systemic nature of the problems indicates that there might be
many other scientific papers that, like the paper of Chuine et al.,
were inappropriately published. Indeed, that is true and I could list
numerous examples. The only thing really unusual about the paper of
Chuine et al. is that the main problem with it is understandable for
people without specialist scientific training. Actually, that is why I
decided to publish about it. In many cases of incorrect research the
authors will try to hide behind an obfuscating smokescreen of
complexity and sophistry. That is not very feasible for Chuine et al.
(though the authors did try).

Finally, it is worth noting that Chuine et al. had the data; so they
must have known that their conclusions were unfounded. In other words,
there is prima facie evidence of scientific fraud. What will happen to
the researchers as a result of this? Probably nothing. That is another
systemic problem with the scientific publication process.

Oops.  By the way, accepting the hypothesis that man made CO2 is causing some warming does not require that one also accept Al-Gore-type estimates of catastrophic 6-8 degrees C warming or more in the next 50 years.  In fact, the evidence still is that man-made warming effects will be small, and predictions of massive warming are way out on a scientific limb with little proof.  I discuss these issues in my article on the skeptical middle ground on climate, as well as my earlier primer on an Inconvenient Truth.

I did not see the ABC special the other night on climate, but I am told that as a skeptic of the extreme global warming scenarios, I was compared to both a holocaust denier and a tobacco executive.  Boy, you gotta love free scientific inquiry!

One of the tricks of all debaters, not just climate folks, is to create a straw man opponent who is easy to knock down.  Now apparently this show did not even bother to interview a skeptic at all, but they chose as their straw man "people paid off by the oil companies who believe man has no effect on climate."

Well, gee, I certainly can see how with current state of knowledge it is getting tougher to credibly sell the "no impact at all" argument, but I would say that with climate and all its vagaries its still a position that a person can stake out and not be a wacko. 

There is, though, a middle ground of skepticism that falls somewhere between "man has no effect" and "temperatures will rise ten degrees and the world will end unless we make Al Gore our economic dictator."

One of the things they never explain on shows like ABC's is that most
climate scientists agree that when other variables are held constant
(more in a minute), increases in CO2 will only increase global
temperatures by 1-2 degrees, some of which we have already seen.  It is
seldom mentioned in the press that there is a strong diminishing return
relationship between CO2 levels in the atmosphere and warming (leaving
everything else equal for a moment).  So, the next doubling in CO2
concentrations will have substantially less impact on global
temperatures than the last doubling.  This is something that most
reputable climate scientists will agree with.

So, how do climate researchers get 6-8 degress of additional warming or
more in their models?  They get it from positive feedbacks.  Most of
Nature's processes are negative feedbacks -- push a pendulum one way,
nature tries to bring it back to the center.  Positive feedback is like
a rock balanced on the top of a mountain -- one little push and it
starts rolling faster and faster.

Climate scientists posit (but as yet have not observed and can't prove)
a number of feedback processes that might tend to amplify or dampen the
effect of increase atmospheric CO2 on global temperatures.  The easiest
to understand is the effect of water.  As temperatures rise due to CO2
concentrations, one might expect clear air humidity to go up worldwide
(as higher temperatures vaporize more water) and you might expect cloud
cover to increase (for the same reason).  If water vapor goes mostly to
humidity, then global warming is accelerated as water vapor in clear
air is a strong greenhouse gas.  One to Two degrees of warming from
increased CO2 might then become four or six or eight.  If instead vaporized water mostly
goes to cloudcover, the effect of CO2 is instead dampened since more
clouds will reflect more sunlight back into space.

Generally, one can make two observations about how most of the climate models
that make the news treat these positive and negative feedback loops:

• Climate scientists tend to include a lot of positive feedback
  loops and downplay the negative feedback loops in their models.  Some
  skeptics argue that the funding process for climate studies tends to
  reward researchers who are most agressive in including these
  acclerating effects.
• The science of these accelerating and decelerating effects is
  still equivocal, and their is not much good evidence either way between
  positive and negative feedback.  We do know that current models with
  heavy positive feedback loops grossly overestimate historic warming.
  In other words, when applied to the past, these positive-feedback-heavy
  models say we should be hotter today than we actually are.

My much longer article on the same topic is here, where I also address other things that may be happening in the climate and reasons why a poorer but colder world may be worse than a warmer and richer world.  I recommend to your attention this article, which is the best statement I can find of the skeptical middle ground. 

A week or so ago, I tried my best to lay out what I thought was a reasonable position on man-made global warming, while at the same time criticizing some of the Al Gore-type over-hype that's out there as climate change evangelists, to put it charitably, get out ahead of the current science. 

In a similar manner, I thought this article by Ron Bailey does a pretty good job at trying to find some stable ground in the climate change debate.

A couple of days ago I expressed frustration at finding a source for even-handed analysis of climate issues.  As someone who accepts more warming than zero but less than Al Gore espouses, I'd like to find a source of climate analysis that I could count on to look at all sides of the issue.  Recently the Prometheus web site was recommended to me.  I am still reviewing it, but you might want to check it out.

By the way, coming soon is the climate cage match to be held by the US House of Representatives.