If you look at all the serious scientists in the world, there is no big disagreement on the basics of this...it would be absolute lunacy to act as if climate change is not occurring.

To claim the World Bank is just an extension of US foreign policy is just wrong.

I've never really had much of a career plan, and interesting opportunities kept cropping up.

The scientific evidence is now overwhelming: climate change presents very serious global risks, and it demands an urgent global response.

Do politicians understand just how difficult it could be, just how devastating rises of 4C, 5C or 6C could be? I think, not yet

The one way of guaranteeing to fail is to assume that we will.

This [climate change] is potentially so dangerous that we have to act strongly. Do we want to play Russian roulette with two bullets or one?