The average ordinary citizen can do a lot of different things when it comes to the climate crisis.

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.

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.

What I would say to filmmakers, if I may be so bold or so arrogant, is to draw inspiration from other filmmakers, but go to the place in your own gut where everything is nothing. That's a very Zen thing to say, but that place of nothing is where real creativity comes out of.

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

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

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.

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