Little kids sing a song called "America the Beautiful." They sing a song called "This Land Is Your Land, This Land Is My Land." To me, those songs are not just nice little ditties. They are marching orders. They are commandments that we must protect America's beauty from the clear-cutters, the strip-miners, the oil spillers. They are pledges we have made. They are promises to keep.

To change our laws and culture, the green movement must attract and include the majority of all people, not just the majority of affluent people.

Dirty energy is a finite resource; the more of it we use, the scarcer it becomes.

Though the rampant racial injustices throughout the criminal justice system were offensive to me and to millions of other people, I've never drawn a tight circle around the black community to define the limits of my moral concern. But that narrative tends to get imposed on you, if you're an African-American activist.

I want to be remembered as one of the great innovators among social justice advocates of the 21st Century.

The bombs the government drops in Iraq are the bombs that blew up in New York City.

The laws of supply and demand drive up the price, inevitably, over time. But solar and wind are abundant and renewable resources.