Commenting on this post , Notalawyer writes that he (or she) is seriously concerned about global warming especially because
many natural scientists consider this to be a serious and existential problem. Its [sic] entirely possible that global warming could open up more space for human habitation, crop growth etc. But most scientists believe it will have large detrimental effects.
While no one has more respect for the natural sciences than I do, I am not persuaded by Notalawyer’s reasoning. Meteorologists, biologists, horticulturists, zoologists, physicists, entomologists, physicians, and other natural scientists are not economists. (Each might well, and rightly, use as a pseudonym ‘NotanEconomist.’)
While there are some exceptions – Indur Goklany , for example – of natural scientists who understand economics, far too many of them see the world as posing physics or engineering problems rather than as posing economic ones. The two problems are very different from each other.
And the economic way of thinking – studying economic history; pondering the role of entrepreneurship; reflecting on creative destruction; being attuned to the fact that so many social phenomena are the results of human action but not of human design; understanding the fact that market-determined prices both signal important information about resource availabilities and give consumers and producers incentives to change their actions in accordance with changes in resource availabilities – gives economists a different perspective from that of natural scientists on the range of likely economic consequences of climate change. One manifestation of this different perspective offered by economics is that the prospect and possibilities of productive human creativity seem to be more readily grasped by the typical economist than by the typical natural scientist.
Natural-scientists’ track record on predicting the economic impact of environmental changes is poor – at least, this is my off-the-cuff sense. Most famously, the scientist Paul Ehrlich has been consistently and magnificently mistaken about the effects of economic and population growth on human well-being . Likewise, Jared Diamond, for all of his undoubted brilliance, fundamentally misconstrues the most basic features of globalization . (See also here .) So, too, the great E.O. Wilson  (whose 1994 autobiography Naturalist , I enthusiastically add, is among the most enjoyable of that genre that I’ve ever read).
I don’t blame natural scientists for their frequent failures to grasp even basic economics. Each of these scientists is a specialist in his or her own field. It would be as out of place for me to criticize, say, a scientist who specializes in the study of ants for his poor grasp of economics as it would be for the ant-specialist scientist to criticize me for my poor grasp of the biology and behavior of ants. The difference is that I don’t fancy that my expertise in economics equips me to speak with any authority at all on ant science or on other natural-science matters.
Here’s what my colleague Jim Buchanan  wrote in December 1976:
The principle that exposure to economics should convey is that of the spontaneous coordination which the market achieves….
I recently talked with a prominent economist who mentioned that one of his colleagues had reported having several conversations with the then presidential candidate Jimmy Carter. This colleague passed along his view that Carter was a “good systems analyst,” and my friend added, more or less as an afterthought, and “hence, a good economist.” I very quickly and very emphatically put him straight, saying that nothing could be further from “the economic point of view,” properly interpreted, than that of the systems analyst. Indeed, this is precisely my own fear about Carter, that he is, in fact, a good systems analyst without the remotest understanding of the principle of spontaneous order. [James M. Buchanan, What Should Economists Do?  (Indianapolis: Liberty Fund, 1979), pp. 81-82; original emphasis].