Scientists have been warning about global warming for decades. It's too late to stop it now, but we can lessen its severity and impacts.

Fukushima is the most terrifying situation I can imagine.

Humanity is facing a challenge unlike any we've ever had to confront. We are in an unprecedented period of change.

A baby nursing at a mother's breast... is an undeniable affirmation of our rootedness in nature.

I've always been more interested in organisms that can move on their own than in stationary plants. But when I canoe or hike along the edge of lakes or oceans and see trees that seem to be growing out of rock faces, I am blown away. How do they do it?

Think about a seed. Once it lands, it's stuck. It can't move to find better soil, moisture or sunlight. It's able to create every part of itself to grow and reproduce with the help of air, water and sun.

I can't imagine anything more important than air, water, soil, energy and biodiversity. These are the things that keep us alive.