I have a private plane. But I fly commercial when I go to environmental conferences.

We won't have a society if we destroy the environment.

I think the cost of energy will come down when we make this transition to renewable energy.

Much of the debate over global warming is predicated on fear, rather than science.

The environment is everything that isn't me.

You may be able to fool the voters, but not the atmosphere.

People blame their environment. There is only one person to blame - and only one - themselves.

Unless we keep this planet healthy, everything else is for naught.

Never doubt that a small group of thoughtful, committed citizens can change the world indeed, it's the only thing that ever has.

It seems that every time mankind is given a lot of energy, we go out and wreck something with it.