I believe the Abominable Snowman may be real. I think there may be something in that.

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.

Your purpose is great than your problems.

I try to not work too many Sundays. At least on Sunday nights, I try to chill out a little bit. I call it Sunday Funday.

Think of yourself as on the threshold of unparalleled success. A whole, clear, glorious life lies before you. Achieve! Achieve!

Truly generous men are always ready to become sympathetic when their enemy’s misfortune surpasses the limits of their hatred.

Depend upon it, there is nothing so unnatural as the commonplace.

The dilemma of our lives is that boys can do everything and girls can do very little.

Institutions which have too much security ... tend to become bureaucratic. They add layers of people and layers of rules in order to assure the security of not making mistakes.

Nature is full of infinite causes that have never occurred in experience.

You can only do two things with your life: give it away or throw it away.

It goes without saying that your friends are usually the first to discuss your personal business behind your back.