Take a course in good water and air and in the eternal youth of Nature you may renew your own. Go quietly, alone no harm will befall you.

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

By polluting clear water with slime you will never find good drinking water.

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

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

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

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

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

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.