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

The cheapest and most efficient way of slowing down global warming is to protect and restore the forests, particularly the tropical forests

But does that mean that war and violence are inevitable? I would argue not because we have also evolved this amazingly sophisticated intellect, and we are capable of controlling our innate behavior a lot of the time.

It's easy to become hopeless. So people must have hope: the human brain, the resilience of nature, the energy of young people and the sort of inspiration that you see from so many hundreds of people who tackle tasks that are impossible and never give up and succeed.

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

Certainly the first true humans were unique by virtue of their large brains. It was because the human brain is so large when compared with that of a chimpanzee that paleontologists for years hunted for a half-ape, half-human skeleton that would provide a fossil link between the human and the ape.

The best relationship you can have with a chimpanzee is total mutual trust.