We cannot go on fiddling while the earth's wild places burn.

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.

Tonight I can write the saddest linesI loved her, and sometimes she loved me too.

Don’t always try to make big improvements – sometimes small incremental daily improvements are all you need.

Refusal to engage in spiritual warfare does not exempt you from being among the next casualties of war

The male is always the pawn in a romantic comedy. Come together, break up, go chase her, get her, roll credits. That's what happens in all of them.

Women have to summon courage to fulfill dormant dreams.

HELPED are those who live in quietness, knowing neither brand name nor fad; they shall live every day as if in eternity, and each moment shall be as full as it is long.

There are no insoluble problems. Only time-consuming ones.

It was a weird mix of emotions. One day, your best friend could be killed. The day before, you could be celebrating him getting a brand-new bike.

The least trusted testimony in a court of law is eyewitness testimony. We are simply not good reporters of facts that happen to us, or in front of us. But that's not the same as knowingly lying.

Without theory, there are no questions.