I suffer much less than many of my colleagues. I am perfectly able to go to Australia and film within three hours of arrival.

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.

Self is for sacrifice and service.

It is not the balance in your check book that makes life count. It is the investment one makes in the lives of others.

To fight with demons, your intent must be pure. And even then, there's no guarantee you'll win.

A friend in need becomes always a friend in need if you help him once......

It is difficult to imagine evolution in alien planets operating in any manner other than Darwinian.

Aviation, this young modern giant, exemplifies the possible relationships of women with the creations of science.

If you are a complete perfectionist, then the truth is that this ice skating business will drive you a little crazy!

It feels like guitarists are samurais. You know, I'm playing a guitar, instead of a katana!

Do not let a day go by without taking some time for yourself - some time you spend in pure pleasure, as you see it.

The function of law and theology are the same: to keep the poor from taking back by violence what the rich have stolen by cunning.