Our identity includes our natural world, how we move through it, how we interact with it and how it sustains us.

If we want to move towards a low-polluting, sustainable society, we need to get consumers to think about their purchases.

Human beings are often at their best when responding to immediate crises - car accidents, house fires, hurricanes. We are less effective in the face of enormous but slow-moving crises such as the loss of biodiversity or climate change.

Protecting the biosphere should be our highest priority or else we sicken and die.

We have become a force of nature.

When I was a kid, being outside was the norm. Rain or shine, our parents would tell us to get out of the house.

Thanks to evolution, our bodies have powerful ways to ward off illness and infection and enable us to live long and healthy lives. Why, then, do health costs continue to climb at unsustainable and frightening rates?