You are what you do, not what you say.

Unless we are willing to encourage our children to reconnect with and appreciate the natural world, we can't expect them to help protect and care for it.

If all humans disappeared today ,the earth would start improving tomorrow.If all the ants disappeared today ,the earth would start dying tomorrow.

Change is never easy, and it often creates discord, but when people come together for the good of humanity and the Earth, we can accomplish great things.

If one day I look out from my cabin's porch and see a row of windmills spinning in the distance, I won't curse them. I will praise them. It will mean we are finally getting somewhere.

If we pollute the air, water and soil that keep us alive and well, and destroy the biodiversity that allows natural systems to function, no amount of money will save us.

In nature there is no such thing as waste. In nature nothing is wasted; everything is recycled.

How you imagine the world determines how you live in it.

Education has failed in a very serious way to convey the most important lesson science can teach: skepticism.

If we want to move towards a low-polluting, sustainable society, we need to get consumers to think about their purchases.

Debating the best way to do something we shouldn't be doing in the first place is a sure way to end up in the wrong place.

They say: 'Seek wisdom while you have the strength, or you may lose the strength without gaining wisdom.

They say you can take someone who was born in Africa out of the bush but you can't take the bush out of someone born there....

All tours are filled with humiliation. My publisher once hired a private jet to fly me to a venue where 1,000 people were waiting. It almost bankrupted him.

You can't solve a problem with the management of technology with more technology.

I made these Sierra trips, carrying only a sackful of bread with a little tea and sugar, and was thus independent and free.

I honestly believe that TV generally is obsessed with the ratings battle to the point of cutting its own throat.

If you do anything for too long, it starts to lack edge, to become too easy. Easy is the kiss of death.

Your vanity and my vanity will never be friends.

.. . . would I were In Grantchester, in Grantchester!

Predictability can lead to failure.