Fundamentally not to waste energy. If we were all to reduce our demands for energy, it would make an enormous amount of difference.

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.

Failures when are huge, dimish the small gasps of success, but these gasps are enough to bring the successful in you

My advice to Robin is listen to your heart, do what you feel. Follow your heart in love and marriage as you would in careers, and you'll be fine. Robin has a great heart. He's a fabulous father.

It is moments like these that force us to try harder, and dig deeper, and to discover gifts we never knew we had - to find the greatness that lies within each of us.

We play our Irish songs a bit more loosely.

Our inability to recall how we really felt is why our wealth of experiences turns out to be poverty of riches.

Always turn your wheel in the direction of the skid.

Obviously my best strategy is to wait, listen, and learn.

Iraq is a better place, absolutely worth it.

In Medford, I awaked the Captain of the Minute Men; & after that, I alarmed almost every house, till I got to Lexington.

We need the wisdom of women, and the experience of married people and parents, and the depth of the contemplative if we are to be formed as preachers.