All our environmental problems become easier to solve with fewer people and harder - and ultimately impossible to solve - with ever more people.

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.

We are healed to help others. We are blessed to be a blessing. We are saved to serve, not to sit around and wait for heaven.

She hadn't realized she was lonely until she began to understand that other people were not.

I know that you always take around because you talk so much, but I like to always know what's happening in your world.

A spinning coin, still balanced on its rim, may fall in either direction.

I never really got obsessed about one thing for long. I was a bit of a butterfly and a magpie.

In our day, you can mock religion in public and even get funds for doing it. But you can't show respect for religion in public - or you risk being hauled into court.

Of course, parents are the most important people in a child's life.

Thought maps existence; fantasy colors it.

God, what is all this talk put out by the popes? Paradise is here, my good man. God, give me no other paradise!

I'm the oldest 26-year-old I know. A lot of experience has been crammed into a short amount of time. Some days I feel a good 65, 70. Like I want to lie down.