evidence: The head of the Environmental Protection Agency (EPA) said he does not believe that carbon dioxide is a main driver of climate change. "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. So no, I would not agree that it's a primary contributor to the global warming that we see," EPA chief Scott Pruitt told CNBC's morning news show "Squawk Box" yesterday (March 9). [...] Carbon dioxide is no dark-horse candidate for the warming of the atmosphere. In 1896, Swedish scientist Svante Arrhenius (who would later win the first-ever Nobel Prize for Chemistry) published a paper in the Philosophical Magazine and Journal of Science that laid out the basics of what's now known as "the greenhouse effect."