In 1998, I was screening 'Good Will Hunting' at Camp David. And I was saying, 'Nice to meet you, Mr. President. Nice to meet you, Mrs. Clinton.' Madeleine Albright, Sandy Berger, Senator Daschle. It was an extraordinary day.

Being with Al Gore on the red carpet in Cannes was exciting - he's like a rock star unto himself!

I had one of those light bulb 'a ha' moments while screening 'Good Will Hunting' in Camp David in 1998 - Madeleine Albright and the Clintons were there, and I just became really inspired by all of these amazing people. I left the screening asking myself what I could do.

To be sure, governments will remain critical to any comprehensive effort to save our planet.

If you go back and look at President Reagan's speeches, they bring you to tears almost.

I was with - he wasn't the president then, but - Barack Obama, when he was running, in Washington, during Black Congressional Caucus Weekend, and did a panel about global warming with him. It was almost as if I switched careers for a while, and became a political activist.

Film is a very collaborative medium. If you're smart enough, you learn how to maintain your vision while drawing resourcefully from all the people around you.