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

Unless we stop dumping 70 million tons of global warming pollution into the atmosphere every 24 hours, which we are doing right now ... the continued acceleration of this pollution would destroy the future of human civilization.

We're all capable of mistakes, but I do not care to enlighten you on the mistakes we may or may not have made.

I would kiss Tipper much longer.

When energy prices go up, the difficulty of projecting demand also goes up - uncertainty goes up.

As president, I will bring all the parties and stakeholders together. I am going to come up with a solution that respects the environment and does not cause an upheaval in the economy.

The scientific evidence of how serious this climate crisis is becoming continues to amass week after week after week.