The fact is that no species has ever had such wholesale control over everything on earth, living or dead, as we now have. That lays upon us, whether we like it or not, an awesome responsibility. In our hands now lies not only our own future, but that of all other living creatures with whom we share the earth.

I believe the Abominable Snowman may be real. I think there may be something in that.

The human population can no longer be allowed to grow in the same old uncontrollable way. If we do not take charge of our population size, then nature will do it for us and it is the poor people of the world who will suffer most

What humans do over the next 50 years will determine the fate of all life on the planet.

There is no question that climate change is happening; the only arguable point is what part humans are playing in it.

One in eight plant species face extinction.

I'm a humanist. I'm neither one side nor the other.