It may matter more than you think.

"The Science Guy" enters the fact-challenged world of politics.

Obama could reach his 2020 climate goal. Here's how.

We watched the speech so you don't have to.

Is President Obama pursuing "a war on coal," as Republicans and coal industry officials frequently charge? To a large extent, the answer is yes.

Some key GOP senators have portrayed her as the embodiment of Obama's environmental policy.

President Obama may have to regulate existing power plants if he wants to constrain the nation's carbon output.

Even as scientists describe climate change as urgent, public intensity on the issue is waning.