A zebra does not change its spots.

The United States is the only nation that can lead the world toward a solution on climate change.

I take no pleasure in the fact that the scientific predictions I’ve relayed to popular audiences turn out to be true.

Surveillance technologies now available - including the monitoring of virtually all digital information - have advanced to the point where much of the essential apparatus of a police state is already in place.

I want to extend condolences to the families of those who died in the service of the United Nations.

There are many who would much prefer that the word 'climate' never be mentioned and that the issue be eliminated from our national conversation.

I was recently on a tour of Latin America, and the only regret I have was that I didn't study Latin harder in school so I could converse with those people.