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

While President Bush likes to project an image of strength and courage, the real truth is that in the presence of his large financial contributors, he is a moral coward.

Each and every one of us can make changes in the way we live our lives and become part of the solution [to climate change]

I affirm my faith when I'm asked about it. But I always try to do so in a way that communicates absolute respect, not only for people who worship in a different way, but just as much respect for those who do not believe in God and who are atheists.

Junkies find veins in their toes when the veins in their arms collapse. Developing tars sands is the equivalent.

Where solar energy is concerned - and wind energy and battery storage and electric vehicles and efficiency technologies - that is what we are now seeing. So, yes, I'm very optimistic, but anyone who works on the climate crisis has an internal struggle between hope and despair. I won't deny that, but hope has always prevailed in my outlook.

I think that asserting that former President Obama wasn't born in the United States was just the height of irresponsibility, of course. And Donald Trump corrected that one. There are others that have yet to be corrected.