We can't negotiate the facts. We can't negotiate the truth about the situation. And for those who are too fearful to finish, it can be done and must be done. Make sure we succeed, . . . It is wrong for this generation to destroy the habitability of our planet and ruin the prospects of every future generation.

I saw the logarithmic growth of computer power.

We sometimes emphasize the danger in a crisis without focusing on the opportunities that are there. We should feel a great sense of urgency because it is the most dangerous crisis we have ever faced, by far. But it also provides us with opportunities to do a lot of things we ought to be doing for other reasons anyway. And to solve this crisis we can develop a shared sense of moral purpose.

No controlling legal authority

George Orwell once wrote that a false belief sooner or later collides with physical reality, usually on a battlefield.

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

Politics has become a game of meaningless, mindless battles, conducted by unscrupulous methods and people, designed to transform even the most serious policy debates into sport.