Well, in some ways we're not successful at all. We're destroying our home. That's not a bit successful.

At some point, my body will collapse. But I hope that my brain will still be working so that I can carry on with writing.

If we kill off the wild, then we are killing a part of our souls.

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.

However much you know giraffes, to see one in the wild for the first time feels prehistoric.

Studying chimps, I came to the conclusion that being evil is something that only humans are capable of. A chimp would never plan to pull another's nails out. The chimps' way of aggression is quick and brutal. I compare them to gang attacks.

Here we are, arguably the most intelligent being that's ever walked planet Earth, with this extraordinary brain ... and yet we're destroying the only home we have.