President Obama's announcement that the EPA will require power plants to reduce carbon emissions by 30% may prove to be the most important thing he has done. Cynical pundits say this will hurt Democrats in November, but the consensus of scientists is that we must start dealing with man-made climate change now. President Obama is the rare politician who does what's right, not what's popular. He has guided the country through the worst economic crisis since the Great Depression, ended the Iraq War and wound down the war in Afghanistan, accomplished reform of the health care system, and now taken decisive action on climate change. In contrast, Republicans have obstructed progress and offered no realistic solutions to the important problems facing our country. The American people understand this.