You better not mess with chimps. They are much stronger than humans.

We are always talking about how we can get more environmental and humanitarian education. It is about listening to the voice of young people - how they feel, and what would be most meaningful for them.

Mainly because as women's education increases all around the planet, we find that family size tends to drop.

I don't have any idea of who or what God is. But I do believe in some great spiritual power. I feel it particularly when I’m out in nature. It’s just something that's bigger and stronger than what I am or what anybody is. I feel it. And it's enough for me.

We're the ones who can make a difference. If we lead lives where we consciously leave the lightest possible ecological footprints, if we buy the things that are ethical for us to buy and don't buy the things that are not, we can change the world overnight.

The only possible way to get somebody to change is to reach into their hearts.

One thing I had learned from watching chimpanzees with their infants is that having a child should be fun.