October 1 is Yosemite National Park's 124th anniversary!
In India, 400 million people still lack access to electricity. Read how hyper-local solar-energy systems are lighting up the country's darkest outposts.
See that bushy-tailed rodent chattering in the tree outside your house? It could be preparing to take down the electric grid.
New animals in stock! Adopt a wild animal and help support the Sierra Club.
Dozens of residents of Gretna, Louisiana steeled for battle in their fight against a proposed coal export terminal in Plaquemines Parish on the Gulf Coast.