It has yet to be proven that intelligence has any survival value.

New ideas pass through three periods: 1) It can't be done. 2) It probably can be done, but it's not worth doing. 3) I knew it was a good idea all along!

This is the first age that's ever paid much attention to the future, which is a little ironic since we may not have one.

Sometimes I think we're alone in the universe, and sometimes I think we're not. In either case the idea is quite staggering.

I thought I'd love to be a gardener because I grew up with a vegetable garden and I love being close to the Earth and growing things. At my home in L.A., I have a great garden and I grow all kinds of things. I even have a worm farm! The worms help create organic compost out of kitchen scraps.

Climate change may not be the most important issue to every American, but strong majorities do consider it a major problem, and they aren't likely to take seriously a candidate who denies the science and who is plainly in the pocket of the polluters.

The U.K.'s climate change act was passed by a majority of 463 votes to three. That is really quite extraordinary. The will of parliament has rarely been expressed so strongly and unambiguously.

The environmental movement, like all political processes, reacts best to disasters. But these are very slow, very gradual disasters in the making.