The hardest part of returning to a truly healthy environment may be changing the current totally unsustainable heavy-meat-eating culture of increasing numbers of people around the world. But we must try. We must make a start, one by one.

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

To me, trees are living beings and they have their own sort of personalities.

We, as humans, have actually developed a sense of social responsibility. We have gone beyond our basic instincts.

When I go back to Gombe it's to be in that timeless world where it's soft and where life is entwined and you actually see the pattern of nature. I always feel this great spiritual power which I believe is around.

Having respect for animals makes us better humans.

We learn the social norms of our society and modify our behaviour accordingly.