True wilderness is where you keep it, and real wilderness experience cannot be a sedentary one; you have to seek it out not seated, but afoot.

The more we pour the big machines, the fuel, the pesticides, the herbicides, the fertilizer and chemicals into farming, the more we knock out the mechanism that made it all work in the first place.

All technology should be assumed guilty until proven innocent

Overpopulation is perhaps the biggest problem facing us, and immigration is part of that problem. It has to be addressed.

Truth and beauty can still win battles. We need more art, more passion, more wit in defense of the Earth.

Sometimes luck is with you, and sometimes not, but the important thing is to take the dare. Those who climb mountains or raft rivers understand this.

Understanding how DNA transmits all it knows about cancer, physics, dreaming and love will keep man searching for some time.

We are no longer inheriting the Earth from our parents, we are stealing it from our children.

Without wilderness, the world's a cage.

Apollo 13, as you may remember, gave us a reactor that is bubbling away right now somewhere in the Pacific. It's supposed to be bubbling away on the moon, but it's in the Pacific Ocean instead.

Bring diversity back to agriculture. That's what made it work in the first place.

An empty mind is easy to feed.

A woman knows what it means to experience the world as her individual self. That gives her insight into her own reality.

In the company of ignorance, be silent…and run!

I wouldn't want to direct. I see how much work it is.

You cannot put it all in God's hands. God is busy.

You can’t let your current circumstances dictate what kind of choices you make.

When I get down on my knees, it is not to pray.

Writing was a chimney for my blazing ambitions.

Rampant technolgy eliminates luxury, but not by declaring privilege a human right; rather, it does so by both raising the general standard of living and cutting off the possibility of fulfilment.

I try to be as ruthless as possible. I ask myself of each sentence, "Is it clear? Is it true? Does it feel good?" And if it's not, then I rewrite it.