Urban farmers are eyeing rooftops that are already green as potential sites to grow food. But there are big obstacles to rooftop farming — from permitting to transporting water and soil to the top of a building.

The usually well-behaved ribbon of high winds that runs eastward across North America has wandered all over the place recently, and even split in two. That's caused a whole host of extreme weather in the Northern Hemisphere, including the recent rains in Colorado, bitter cold in Florida and a heat wave in Alaska.

Bananas are the most popular fruit in America, and demand is growing worldwide, too. But growing bananas requires a lot of pesticides. And a new study shows that some of those chemicals are ending up in caimans living downstream from banana plantations in Costa Rica, where many of the bananas that Americans eat are grown.

Ahead of a debate on Wednesday night and with polls showing a tight race, Virginia gubernatorial contenders Terry McAuliffe and Ken Cuccinelli are finding contrasts wherever they can—including their records on the environment and energy.

Scientists are about to deliver another major assessment of climate change. The report from the Intergovernmental Panel on Climate Change involved hundreds of scientists from around the world and has left some of them wondering whether there's a more effective way to put the document together.

A scientist in Birmingham, Ala., is trying to help overharvested sea urchins, considered a delicacy in many parts of the world, find their way back to a restaurant near you. He's developed an urchin farm to help grow them more sustainably and a special feed that gives them a sweet umami taste.

The first time nature writer Jackson Landers spotted a black widow spider on his front porch, he was transfixed. He grew curious about the spiders and kept one for months as a pet. One day, he got bit.

The storm, which packed winds of 150 mph on Friday, is expected to weaken before it hits the Chinese territory.

Under the proposal from the Environmental Protection Agency, new plants that run on coal would only be permitted to emit about half as much carbon dioxide as the average coal plant puts into the air today. Emissions from the electricity industry are already declining as utilities turn to natural gas and wind farms.

Brazil's Atlantic Forest, home to the golden lion tamarin, was once a massive ecosystem stretching along the Brazilian coast. But centuries of human activity have encroached upon the forest, leaving the future of this tiny, lion-maned monkey in doubt.