A decade ago, environmentalists and the federal government agreed to revive a 150-mile stretch of California's second-longest river, an ambitious effort aimed at allowing salmon again to swim up to the Sierra Nevada foothills ...
An environmental group accused three major television manufacturers Wednesday of misleading consumers and regulators about how much energy their high-definition screens devour by designing them to draw less power during government ...
In a bid to stop the killing of elephants for their tusks, world governments voted at a major conservation conference to urge the closure of all domestic ivory markets.
The United States and China on Saturday formally joined the Paris climate change agreement, with President Barack Obama hailing the accord as the "moment we finally decided to save our planet".
Wildlife advocates reached a tentative agreement with the U.S. government in a legal dispute over an endangered fish in the Yellowstone River along the Montana-North Dakota border.
Obscured by polluted haze, workers are putting the finishing touches to towering smokestacks on a multi-billion-dollar coal-to-oil plant in China that will pump out vast amounts of carbon dioxide when in operation.
California wants more drivers to dump the pump and plug in.
An escalating legal fight over a $59 million federal dam project on Montana's lower Yellowstone River could decide the fate of an endangered, dinosaur-like fish population that has been blocked from its spawning grounds for ...
The operator of an oil pipeline that broke and spilled thousands of gallons of crude across a scenic California shoreline says it could take weeks or even months before investigators find what caused the disaster.
Los Angeles, known for its cars, smog and sprawl, wants to reinvent itself as the home of electric vehicles, solar panels and bicycle paths.