Sometimes you check things off because you've done them. If you aren't checking stuff off your bucket list, you aren't living very well.

I absolutely am an environmentalist. I am probably more of an environmentalist than most people who live in the world, but I think that comes from my position in the world and that doesn't make me a better person.

I think political science is bad at prediction. We don't gaze into a crystal ball. I do not believe that we predict things.

There is too large a divergence at the moment in the interests and values of the world's most powerful states.

It's very hard for someone who makes $1,000 a year or some who makes less than $1 a day to care about the environment.

The two world wars boosted American power and devastated potential rivals to an extent that could not have lasted more than a few decades.

I think it's fantastically narcissistic to believe that in the entire universe, with all of the planetary systems that we've already discovered and the countless others that are out there, that we are the only forms of life. Now, the real question is not are there other forms of life out there, but are there other intelligent forms of life out there right now. Because the universe is not only really big but it's also really long. It's been around for a long time; it's going to be around for a long time.