E.P.A. Faces First Volley From the House - NYTimes.com

“So when the new chairman of the Energy and Commerce Committee says E.P.A. cannot pass by regulation what Congress failed to pass by law, let me correct him – Congress passed our Clean Air laws, Republican Presidents signed them, and those are the laws the E.P.A. is following,” Ms. Boxer said.

When did Congress and Republican Presidents decide that carbon dioxide is a dangerous pollutant?