Fifteen per cent of the population believe the moon landing was actually staged in a movie lot in Arizona and somewhat fewer still believe the Earth is flat. I think they all get together with the global warming deniers on a Saturday night and party

Our insatiable drive to rummage deep beneath the surface of the earth is a willful expansion of our dysfunctional civilization into Nature.

What's really important is how our country gets through Trump period, because nothing's getting done in Washington. Every day it's another set of tweets and another set of controversies. And they're not getting anything done.

We have a planetary emergency. We have to find a way to create, in the generation of those alive today, a sense of generational mission.

No controlling legal authority

Airplane travel is nature's way of making you look like your passport photo.

Future generations may well have occasion to ask themselves, "What were our parents thinking? Why didn't they wake up when they had a chance?" We have to hear that question from them, now.