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Bernie Sanders and Martin O'Malley jabbed at Hillary Clinton during a Democratic forum in South Carolina Friday night, questioning the frontrunner's liberal bona fides.

Over the next six days, the city is dumping untreated sewage into the river, which runs from the Great Lakes to the Atlantic Ocean.

The Canadian company that had been pushing for approval to build the project is asking for a timeout in the review process. Here's what you should know.

The U.S. government says the German automaker's software allowed 10,000 more diesel cars than it had acknowledged earlier to run more cleanly during emissions testing than in real-world conditions.

There's no barrier between the underground chemical reaction and nearby radioactive waste. Federal, state and local officials disagree about the danger it poses; residents are confused and concerned.

For generations, the rubber tappers of the Amazon have gone about their business in a way that preserves the rain forest. Today, they are increasingly in conflict with criminal logging gangs.

The French disease fighter had a healthy fear of microbes. So does a new report, which worries that humankind might not be ready to fight off the next pandemic.

The 26th U.S. President spent his summers at a mansion on an 83-acre estate on New York's Long Island. Sagamore Hill has reopened to visitors after a three-year restoration project costing $10 million.

California's drought and mandatory conservation measures are taking a toll on Los Angeles' green spaces. First to go were lawns, and now people are not watering their trees.

Are solar panels the best way to connect millions of Africans to electricity? That's the plan the president will tout on his visit to Kenya. Critics ask: What about tapping into power lines?