evidence: The head of the Environmental Protection Agency says he does not agree that carbon dioxide is the main driver of climate change. The new head of the Environmental Protection Agency, Scott Pruitt, has already put himself at odds with the vast majority of climate scientists. In a TV interview today, Pruitt said he does not believe that carbon dioxide is a primary contributor to climate change. As NPR's Nathan Rott reports, his own agency has said otherwise. [...] SCOTT PRUITT: No. I think that measuring with precision human activity on the climate is something very challenging to do. And there's tremendous disagreement about the degree of impact. That - so, no, I would not agree that it's a primary contributor to the global warming that we see.