Anyone who deals with the climate crisis has an internal dialogue between hope and despair, because the challenge is so huge and the danger is so great and the stakes are so high. But I have always resolved that in favour of hope, and actually I'm more hopeful now than I was a decade ago when the solutions were visible on the horizon, but you had to seek reassurance that the technology experts that they're coming, they'll be here.

If the only tool we use to analyse what's valuable is a price tag, then those things that don't have price tags begin to look like they have no value.

If you look at the way all of the new reform movements dedicated to the public interest are living and thriving on the Internet, I do think there is still some considerable hope that the full participation of individuals in that conversation of democracy can once again restore the integrity of the way our democracy works.

The ability of big money to shape perceptions - where you have four anti-climate lobbyists for every single member of the House and Senate - is a big factor.

I smoked pot in college and in the Army.

Iraq does pose a serious threat to the stability of the Persian Gulf and we should organize an international coalition to eliminate his access to weapons of mass destruction. Iraq's search for weapons of mass destruction has proven impossible to completely deter and we should assume that it will continue for as long as Saddam is in power.

The ten hottest years in the atmospheric record, going back only 160 years, have been in the last eleven years.