Levitt is an economist, but he is mostly famous for social science research
on abortion that turned out to be wrong, and for various things to make his
ideas more saleable to the public. I would not expect him to have anything useful to say about global warming anyway.
The statements being circulated create the false impression that our analysis of the global-warming crisis is ideological and unscientific. Nothing could be further from the truth.I guess that means that he will post a substantive response.
Update: More criticism of Levitt here.