evidence: WASHINGTON (Reuters) - The new head of the Environmental Protection Agency said on Thursday he is not convinced that carbon dioxide from human activity is the main driver of climate change and said he wants Congress to weigh in on whether CO2 is a harmful pollutant that should be regulated. [...] Pruitt, 48, is a climate change denier who sued the agency he now leads more than a dozen times as Oklahoma's attorney general. He said he was not convinced that carbon dioxide pollution from burning fossil fuels like oil, gas and coal is the main cause of climate change, a conclusion widely embraced by scientists. [...] "So no, I would not agree that it’s a primary contributor to the global warming that we see," Pruitt said. "But we don’t know that yet, we need to continue to debate, continue the review and analysis."