COP23

Non-governmental coalitions stepped up in the U.S.'s relative absence at COP23 this year. Is their activism the only thing keeping climate change at bay in America?

Officials from the alliance hope to more than double their number by next year's meeting.

The country presiding over the United Nations climate summit rotates every year, but experts say location matters less than leadership.

While diplomats travel to Germany, we're sending our reporter to the front lines.