If you watch animals objectively for any length of time, you're driven to the conclusion that their main aim in life is to pass on their genes to the next generation.

No one will protect what they don't care about, and no one will care about what they have never experienced.

The truth is: the natural world is changing. And we are totally dependent on that world. It provides our food, water and air. It is the most precious thing we have and we need to defend it.

Instead of controlling the environment for the benefit of the population, perhaps we should control the population to ensure the survival of our environment

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

Anyone who believes in indefinite growth on a physically finite planet is either mad or an economist

The World is full of wonders, but they become more Wonderful, not less Wonderful when Science looks at them.

The question is, are we happy to suppose that our grandchildren may never be able to see an elephant except in a picture book?

How could I look my grandchildren in the eye and say I knew what was happening to the world and did nothing.

Bringing nature into the classroom can kindle a fascination and passion for the diversity of life on earth and can motivate a sense of responsibility to safeguard it.

I just wish the world was twice as big and half of it was still unexplored.

Perhaps it's better if I live in your heart, where the world can't see me. If I'm dead, there will be no stain on our love.

I'm tired of all this nonsense about beauty being skin deep. That's deep enough. What do you want, an adorable pancreas?

The lesson? To respond to the unexpected and hurtful behavior of others with something more than a wipe of the glasses, to see it as a chance to expand our understanding.

At the end, [Eva Braun] begged me to spare these letters [to Adolf Hitler] and bury them. She specifically wrote to me and told me over the phone not to read any of the letters, she made me promise.

I don't feel I'm making a conscious effort to go more commercial.

It is impossible to fully comprehend the evil that would have conjured up such a cowardly and depraved assault upon thousands of innocent people.

Tavi grinned. "Are you with me?" "The plan is insane," Ehren said. "YOU are insane." He looked around the inside of the tent. "I'll need some pants.

If the women in the factories stopped work for twenty minutes, the Allies would lose the war.

Mass attention is almost unattainable and it's not clear that you want it.

I could be wrong. Not being certain is what being a philosopher is all about.