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

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?

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.

You’re a good date, ” he said.“You thought of it as a date?”He nodded. “From the beginning.

I think there's something great and generic about goldfish. They're everybody's first pet.

What is the essence of life? To serve others and to do good.

No man who drank or smoked could ever come nearer to me than the telephone. I'd say, I won't let you - you nicotine-soaked, beer-besmeared, whiskey-greased, red-eyed devil - talk to me face to face.

Whatever you think in life... think higher and feel deeper.

Closest to the truth are those who deal lightly with it because they know it is inexhaustible.

There are so many good authors; there's no shortage of them.

Find me a reasonable lover against his weight in gold.

Number was the substance of all things.

Plants seem like an excellent model for the kind of future that we should be building.