Kevin Vranes and I are quoted in a Houston Chronicle story today on the “overselling” of climate science. Kevin just posted his reactions. I have a few reactions as well.


First, I was surprised to see the following quote from NAS President Ralph Cicerone, which I had not seen before:

I think we understand the mechanisms of CO2 and climate better than we do of what causes lung cancer. … In fact, it is fair to say that global warming may be the most carefully and fully studied scientific topic in human history.

Not only is this absurd on its face, it is politically dangerous for those wanting action on climate change. Consider another similar statement along these lines from RealClimate’s Ray Pierrehumbert:

On the subject of controversy and evidence for evolution vs. evidence for CO2-induced global warming, I’d say both are well supported but that in some ways the case for anthropogenic global warming is a bit more straightforward. That’s because its mostly physical science rather than biology. We have quantitative mathematical representations of far more of the process, and ways of testing individual bits in a more straightforward way (as in laboratory measurements of infrared absorption by CO2). Evolution proceeds slowly, and while there are definitely cases where it can be observed in action, reading the fossil record presents difficulties that are in some ways more challenging than reading the paleoclimate record. There are cases where the difficulties are comparable (e.g. figuring out Cretaceous CO2 levels, or making sense of satellite measurements of tropical lapse rate trends) but on the whole, we know how to take a reductionist approach to climate better than we know how to take a reductionist approach to biology. [Emphasis added. -Ed.]

The comparisons by Drs. Cicerone and Pierrehumbert to smoking and evolution are of course political comments in the guise of science. The thinking appears to be that if you accept certain political action on smoking and evolution, then you necessarily must accept certain political action on climate change because the scientific cases in smoking and evolution are weaker than in climate change yet we take certain actions in those cases. Talk about overselling . . .

The political danger is of course that it is quite appropriate to take issue with the fundamental premise of these statements and use that to argue that we shouldn’t be taking action on climate change until the science is as certain as smoking or evolution. Then one is caught up debating . . . guess what . . . the science of climate change in relation to evolution and smoking, and not policy actions in the face of fundamental uncertainties. I don’t care if climate science is or is not more certain than evolution or smoking, it doesn;t matter one bit for the case for action.

Second, it is interesting to see Judy Curry, a frequent commenter here, offering some support for Kevin Vranes’ views about their being some tension in the community. Of course, she is well positioned to know given that the hurricane community has seen more than its fair share of such tensions.

Finally, I’m quoted at the end of the story as follows:

“I can understand how a scientist without tenure can feel the community pressures,” says environmental scientist Roger Pielke Jr., a colleague of Vranes’ at the University of Colorado.

Pielke says he has felt pressure from his peers: A prominent scientist angrily accused him of being a skeptic, and a scientific journal editor asked him to “dampen” the message of a peer-reviewed paper to derail skeptics and business interests.

“The case for action on climate science, both for energy policy and adaptation, is overwhelming,” Pielke says. “But if we oversell the science, our credibility is at stake.”

For those wanting more details about pressures I’ve personally experienced, please have a look at this post.