For how many people do you think might yet stand on this planet before the sun grows cold? That's the responsibility we hold in our hands.

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.

I'd rather make a good run than a bad stand.

What does it mean to die when you can live until the end of the world?

Your enemy is one who misunderstands you; why should you not rise above the fog and see his error and respect him for the good qualities you find in him?

It is not love of self but hatred of self which is at the root of the troubles that afflict our world.

Good writing is good writing no matter what genre you're writing in, and I believe that there are only a handful of fundamental craft tools that are essential for any genre-including nonfiction.

I think the day that I become comfortable doing interviews and going on talk shows is the day that I don't know what it is to be a human being anymore.

The broader the topic, the easier it is, not only to fill a book, but to set the bar pretty high for really great stuff.

Although the road is never ending take a step and keep walking, do not look fearfully into the distance... On this path let the heart be your guide for the body is hesitant and full of fear.

~As a working mother high heels don't really fit into my life anymore - but in a totally wonderful way. I would much rather think about my son than myself.~

I have a million nightingales on the branches of my heart singing freedom.