We've built a new Earth. It's not as nice as the old one; it's the greatest mistake humans have ever made, one that we will pay for literally forever.

I am still a consumer; the consumer world was the world I emerged into, whose air I breathed for a very long time, and its assumptions still dominate my psyche—but maybe a little less each year....There are times when I can feel the spell breaking in my mind….There are times when I can almost feel myself simply being.

The laws of Congress and the laws of physics have grown increasingly divergent, and the laws of physics are not likely to yield.

Solar power seems to be truly bipartisan in its appeal.

The end of nature sours all my material pleasures. The prospect of living in a genetically engineered world sickens me. And yet it is toward such a world that our belief in endless material advancement hurries us. As long as that desire drives us, here is no way to set limits.

The latest computer modeling I've seen indicates that at mid-century, there might be 150 million people classified as "environmental refugees."

When you are in a hole, stop digging!