Rapid population growth and technological innovation, combined with our lack of understanding about how the natural systems of which we are a part work, have created a mess.

Global trade has advantages. For starters, it allows those of us who live through winter to eat fresh produce year-round. And it provides economic benefits to farmers who grow that food.

Although they [light and medium trucks] have only 5% of the transportation market..., they account for fully 35% of greenhouse gas emissions from freight transportation.

Water is our most precious resource, but we waste it, just as we waste other resources, including oil and gas.

So we draw lines around our property, our counties, our cities, our states, our countries. And, boy, do we act as if those lines are important. I mean, we go to war. We will kill and die to protect those boundaries. Nature couldn't give two hoots about our national boundaries.

Hydraulic fracturing requires massive amounts of water. Disposing of the toxic wastewater, as well as accidental spills, can contaminate drinking water and harm human health.

Fukushima is the most terrifying situation I can imagine.