...the debate among the scientists if over. There is no more debate. We face a planetary emergency. There is no more scientific debate among serious people who've looked at the science...Well, I guess in some quarters, there's still a debate over whether the moon landing was staged in a movie lot in Arizona, or whether the Earth is flat instead of round.

When energy prices go up, the difficulty of projecting demand also goes up - uncertainty goes up.

Distributed intelligence is the key to the advancement of human civilization. Dictatorships, communist countries, monarchies in the past all eventually collapsed because of their inefficiency in moving information.

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

I flew on Air Force Two for eight years, and now I have to take off my shoes to get on an aeroplane.

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

Although I have a variety of obligations, the climate crisis is my central concern.