I'm no longer sceptical. I no longer have any doubt at all. I think climate change is the major challenge facing the world..

The World is full of wonders, but they become more Wonderful, not less Wonderful when Science looks at them..

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

Everyone likes birds. What wild creature is more accessible to our eyes and ears, as close to us and everyone in the world, as universal as a bird?.

No one will protect what they don't care about, and no one will care about what they have never experienced..

Being in touch with the natural world is crucial..

If we [humans] disappeared overnight, the world would probably be better off..

An understanding of the natural world and what's in it is a source of not only a great curiosity but great fulfillment....

The future of life on earth depends on our ability to take action. Many individuals are doing what they can, but real success can only come if there'….

Its about cherishing the woodland at the bottom of your garden or the stream that runs through it. It affects every aspect of life..

People must feel that the natural world is important and valuable and beautiful and wonderful and an amazement and a pleasure..

The nature of human beings is that they'd far rather face the disaster that is happening tonight than the one that is happening tomorrow..

I don't know [why we're here]. People sometimes say to me, 'Why don't you admit that the humming bird, the butterfly, the Bird of Paradise are proof ….

I'm not over-fond of animals. I am merely astounded by them..

I just wish the world was twice as big and half of it was still unexplored..

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….

There are some four million different kinds of animals and plants in the world. Four million different solutions to the problems of staying alive..

The fact is that no species has ever had such wholesale control over everything on earth, living or dead, as we now have. That lays upon us, whether ….

Anyone who believes in indefinite growth on a physically finite planet is either mad or an economist.

What humans do over the next 50 years will determine the fate of all life on the planet..