…here we see a major problem with IAM-based climate policy analysis: The modeler has a great deal of freedom in choosing functional forms, parameter values, and other inputs, and different choices can give wildly different estimates of the SCC and the optimal amount of abatement. You might think that some input choices are more reasonable or defensible than others, but no, “reasonable” is very much in the eye of the modeler. Thus these models can be used to obtain almost any result one desires.
How (politically) convenient.
As I retweeted, they’re worse than useless to the degree that people trust them for policy decisions.
So why, pray tell, do we spend so much time talking about suburban sprawl and sport utilities, and so little time talking about FedEx and European vacations?
The question answers itself, doesn’t it? Giving up air travel and overnight delivery is much more personally costly for the public intellectuals who write about this stuff than giving up a big SUV. If you live in one of the five or six major cities that contain virtually everyone who writes about climate change, having a small car (or no car), is a pretty easy adjustment to imagine. On the other hand, try to imagine giving up far-flung vacations, conferences, etc. — especially since travel to interesting locales is one of the hidden perks of not-very-well remunerated positions at universities, public policy groups, nongovernmental organizations, and yes, news organizations.
All this outrage is really an admission that Obama is weak, and can’t withstand the kind of criticism routinely directed at other presidents, from Nixon to Clinton to Bush. President Asterisk, indeed.
As I noted on Twitter:
Comparing Obama to a rodeo clown was an insult to rodeo clowns everywhere. @ponder68@WashTimes