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

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.

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.

People must feel that the natural world is important and valuable and beautiful and wonderful and an amazement and a pleasure.

It is ever true that he who does nothing for others, does nothing for himself.

You have to have your heart in the business and the business in your heart.

We forget we’re mostly water till the rain falls and every atom in our body starts to go home.

Libertarians believe consenting adults have the right to do whatever they choose, except band together.

I can only control what I can control.

A century from now it will no more occur to a normal person to mate with a person eugenically unfit than to marry a habitual criminal.

Giving love is the real beautiful experience, because then you are an emperor.

We infer the spirit of the nation in great measure from the language, which is a sort of monument, to which each forcible individual in a course of many hundred years has contributed a stone.

It is one thing to mortify curiosity, another to conquer it.