One in eight plant species face extinction.

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.

The planet's tyrant, dotard Death, had held his gray mirror before them for a moment and shown them the image of things to come.

Dear Boss! Don't be a boss-hole.

Ah! that is the great thing in life, to live the truth.

Any plan conceived in moderation must fail when the circumstances are set in extremes.

There's one sure way to stop us from scoring ... give us the ball near the goal line.

When you play a real person, you feel a sense of responsibility that obviously you don't feel when you're playing a fictional character.

We don't need virtual reality, we need virtual unreality.

My list of things I never pictured myself saying when I pictured myself as a parent has grown over the years.

Mitt Romney, maybe the most moral and decent man who's ever run for president, ended up being a murderer, somebody who didn't care about animals, and a tax cheat.

I always have kind of underneath feeling of peace of mind that I get from just the basic tenants of spirituality.