One should be cautious about "general conceptions." I think a strong case can be made that activism today is as high as ever, perhaps more so, and is also taking new and significant forms. There has never been anything like the international solidarity movements that began to take shape in the 1980s, right in the mainstream, or the global justice movements that have become a very powerful force in later years. It's true that the society is highly atomized, which does induce a sense of hopelessness often - quite mistakenly I think.

There is a reason why Nelson Mandela went to Cuba to praise Castro and thank the Cuban people almost as soon as he got out of jail. That's a third world reaction and they understand it. Cuba played an enormous role in the liberation of Africa and the overthrow of Apartheid, sending doctors and teachers to the poorest places in the world, to Haiti, to Pakistan after the earthquake, almost everywhere. The internationalism is just astonishing. I don't think there has been anything like it in history.

If you sell me a car, we have perhaps made a good bargain for ourselves. But there are effects of this transaction on others, which we do not take into account. There is more pollution, the price of gas goes up, there is more congestion.

We could not bring democracy and freedom to Vietnam at a cost acceptable to ourselves. The idea that that was what we were trying to do, is again, a tautology, it's true by definition because we were doing, and the state is noble by definition. That's called "extreme liberalism".

Groupings of people that get together, think things through, come out to plan and so on, like unions or true political organizations, they've disintegrated. And people tend to be atomized - you get down to a society based on social units based on an atom - an atomic element - which is a person and their computer. Not a society that is going to be able to function freely and democratically. The tendency is there; it doesn't have to be, but its something to worry about.

On abortion: We are talking about ambiguous issues of a complicated kind where you have to balance conflicting interests and concerns.

Sea level rise and destruction of water resources as glaciers melt alone may have horrendous human consequences.