Tom Turner chronicles how the former Sierra Club executive director's insight and activism stimulated the evolution of an entire movement.
Moroccan goats engage in our favorite form of old-school environmentalist protest.
Space lettuce and meatless meat—food has arrived at the next frontier.
It's good and it's bad—Aspen goes 100% renewable, but Alaskans are paying $10 for milk.
Starting September 12, over 170 events will be hosted across the United States and Canada.
If security kinks could be ironed out, smartphone-based voting could dramatically expand voter turnout.
Former First Nations' chief Marilyn Baptiste shut down one of the largest mining projects ever proposed in British Columbia.
A beautiful new photobook documents the resilience and maternal prowess of the world's most famous grizzly bear.
Another parent takes another video of their kid doing something cute. But this time, it’s a polar bear.