I think we're lucky to be living when we are, because things are going to get worse.

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.

Sometimes we forget how important it is just to show up and take care of the good friendships that we have, or might like to have. Good friendships are hard to come by.

In life

No point worrying about a storm until we smell rain

In the central place of every heart there is a recording chamber so long as it receives messages of beauty hope cheer and courage so long are you young.

Better pass boldly into that other world, in the full glory of some passion, than fade and wither dismally with age.

At twenty, a man feels awfully aged and blasé; at thirty, almost senile; at forty, "not so old"; and at fifty, positively skittish.

I don't believe in writer's block. Most of writer's block is having too much time on your hands. My mantra is that you can always edit a bad page; you can't edit a blank page.

You're always learning about this thing everytime you pick it up

I'd love a day devoid of responsibilities. I've often thought about going to a hotel just to have a day away from everything.

That's the way I've been educated: I always think about what I missed and the things that you did, you did them, so you don't have to think about them any more.