I am obstinate and I will not give in.

I think the most important thing to do is to be willing to listen, willing to care, and willing to admit mistakes and change your ways for the better!

Some humans are mathematicians-others aren't.

Certainly, if you look at human behavior around the world, you have to admit that we can be very aggressive.

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.

We can't leave people in abject poverty, so we need to raise the standard of living for 80% of the world's people, while bringing it down considerably for the 20% who are destroying our natural resources.

There are many animal-welfare groups that sometimes seem to forget that human beings are animals too, that we need to include them in our sphere of compassion.