We're the only species that have crapped up the planet and the only species that can clean it up.

When we realize we can make a buck cleaning up the environment, it will be done!

The earth is a tremendous gift. There is nothing else like it in the known universe. I want to leave it the way I found it.

There can be no lasting peace, no security, nor can we as human beings begin to touch our full potential, as long as hunger overwhelms the human spirit around this planet.

If we were driving pure hydrogen automobiles, that automobile would actually help clean up the air because the air coming out of the exhaust would be cleaner than the air going into the engine intake.

If we had a hydrogen economy worldwide, every nation on earth could create its own energy source to support its economy, and the threat of war over diminishing resources would just evaporate.

If you don't generate tension in the film to begin with... you can't really make a purse out of a sow's ear, you know.