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

The only way forward, if we are going to improve the quality of the environment, is to get everybody involved.

Not all is doom and gloom. We are beginning to understand the natural world and are gaining a reverence for life - all life.

If we do not permit the earth to produce beauty and joy, it will in the end not produce food, either.

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

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

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

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

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

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