This chapter in Superfreakonomics has been debunked by Climate Progress, Think Progress, Mother Jones and the Union of Concerned Scientists:

Superfreakonomics –

Update: Note to the authors of Superfreakonomics:

When Paul Krugman, the Union of Concerned Scientists, Joseph Romm, Bradford Delong, Brad Johnson, Matt Yglesias, David Roberts, Tim Lambert, Corbin Hiar, William Connelly, Oliver Willis, Scott Lemieux, Ezra Klein, Daniel Davies, Brian Dupuis, and Mark Thoma have all published scathing criticisms of your book — several days before the book is actually released — something has gone terribly wrong. I mean, wow.