The city is at the crossroads of climate change—and, for a host of reasons, an unsustainable future. 

Are our relations with the animal world going the way of the great auk?

Frustrated, stubborn, committed to bad science, was Louis Agassiz anything other than a laughingstock?

Yes, he said the word “climate”—but he hasn’t committed to any of the big steps needed to avert catastrophe.

On a Farther Shore captures the conservationist’s deep sense of geologic time and the forces of evolution.

"We're not going to outspend the fossil fuel industry," the 350.org founder explains. "We have to find other currencies to work in, and those are the currencies of movements."

If the earth's temperature rises by another 2 degrees celsius, our planet faces mass extinctions.

Awaiting a Keystone decision, environmentalists make a historic vow to engage in mass civil disobedience. 

Energy in Depth, a PR group for oil interests, is leading a campaign to discredit Matt Damon’s new film.

The latest trend toward fossil fuels is dangerous for the entire planet, since China is the world’s largest emitter of greenhouse gases.