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

The environment is everything that isn't me.

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

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

When we try to pick out anything by itself, we find it hitched to everything else in the universe.

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

Harmony with land is like harmony with a friend you cannot cherish his right hand and chop off his left.

I firmly believe that we can have a healthy environment and a sustainable timber industry.

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

Our world faces a true planetary emergency. I know the phrase sounds shrill, and I know it's a challenge to the moral imagination.