I'm not a pessimist, even though I do think awful things are going to happen.

Life does more than adapt to the Earth. It changes the Earth to its own purposes.

No one who has experienced the intense involvement of computer modeling would deny that the temptation exists to use any data input that will enable one to continue playing what is perhaps the ultimate game of solitaire.

There is little evidence that our individual intelligence has improved through recorded history.

There aren't just bad people that commit genocide; we are all capable of it. It's our evolutionary history.

NASA will send up a big sun shade that will be in orbit between the earth and sun and deflect 2 or 3 percent of the sunshine back into space. It would be cheaper than the international space station.

Our future is like that of the passengers on a small pleasure boat sailing quietly above the Niagara Falls, not knowing that the engines are about to fail.