Fifteen per cent of the population believe the moon landing was actually staged in a movie lot in Arizona and somewhat fewer still believe the Earth is flat. I think they all get together with the global warming deniers on a Saturday night and party

Global warming, along with the cutting and burning of forests and other critical habitats, is causing the loss of living species at a level comparable to the extinction event that wiped out the dinosaurs 65 million years ago. That event was believed to have been caused by a giant asteroid. This time it is not an asteroid colliding with the Earth and wreaking havoc: it is us.

I had a detailed plan for my life, but it turned out life had a completely different plan for me. And I feel joy that I have work that feels like it justifies pouring everything I have into it. I never have fallen prey to the illusion that there's any job with as much ability to influence the future as that of President of the United States, but I do feel grateful that I found other ways to do work that serves the public interest.

I'm asking you in your sermons to do the work of the Lord here on earth. I ask for your help in getting that message out urgently tomorrow.

You can say the Earth is flat, but it doesn't mean you're going to fall off the edge.

Hey, you know what, I've gotta go on that 'Letterman' show. That show is so lame.

Today we're dumping 70 million tons of global-warming pollution into the environment, and tomorrow we will dump more, and there is no effective worldwide response. Until we start sharply reducing global-warming pollution, I will feel that I have failed.