It didn't take long for the president to create an ugly environmental legacy.

He's become too jaded and political to be the face of the movement.

Why is the annual event so benign and toothless when the threats to the planet—particularly to its most vulnerable populations—are so severe?

The conservative version would benefit corporations, not the climate.

The EPA head is visiting a Pennsylvania mine owned by a company that wants to get out of the coal business altogether.

Michael Bloomberg argues in a new book that cities and business are the key to reducing global warming. He's forgetting something.

The office is nearly empty, and a climate-change denier may be picked to run it. "There is reason to worry," says Obama's top science advisor.