One of the dangers [that Donald Trump poses, due to the augmented risk of nuclear war] is unquestionable. Of the two existential threats - the threats to the termination of the species basically and most other species - one of them, climate change, on that I think there's no basis for discussion.

The drug problem is in the United States, not in Mexico. It's a demand problem and that is to be dealt with here, and it is not being dealt with. It's been shown over and over that prevention and treatment are far more cost effective than police action, out-of-country action, border control, and so on.

The more privilege you have, the more opportunity you have. The more opportunity you have, the more responsibility you have.

That's unfortunately common - to blame immigrants, to blame the African-Americans who are being helped by federal programs, to blame anyone available, to direct attention away from the roots of the distress which you're suffering. This combines with xenophobia, white supremacy, racism, misogyny, and other quite unpleasant phenomena which are far from being eradicated. All of this makes for a pretty dangerous brew. But economic issues are right in the center of it. And you can see this in the fact that so many former Obama voters now voted for Trump, or just didn't bother voting.

The missile defense component is a minor feature that nobody takes very seriously. Nobody really believes that the US is trying to protect itself from North Korea. That's not serious. But the militarization of space is quite serious.

Technology is basically neutral. It's kind of like a hammer. The hammer doesn't care whether you use it to build a house, or whether a torturer uses it to crush somebody's skull.

The [Ronald] Reagan administration picked up the rhetoric of the anti-nuclear movement; they said "Yyeah, you're right." We have to eliminate nuclear weapons.