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Workers are still removing pieces of the Key Bridge from Baltimore Harbor, but the fight over who will pay to replace it has already begun. Past accidents offer some clues about how it could play out.

A new study counts the human health costs from increasingly costly and dangerous extreme weather in the U.S.

The Trump administration proposes eliminating a 2009 finding that greenhouse gases endanger people. That would undermine the EPA's climate change regulations for power plants and cars.

Last year, a government report linking high levels of fluoride with lower IQ in children contributed to debate over adding fluoride to drinking water. The analysis behind that report is out today.

More than three-quarters of U.S. oil wells, collectively, make just 6% of the country's oil. They're called marginal wells because of how small their output is. But they're a big deal.

Heavy winter rains in California have highlighted the need to capture stormwater and save it for dry times. Los Angeles is currently working on how to do this.

Germany is seeing the return of wolf packs, and with them growing political tension over whether the animals pose too much of a threat.

Millions of people rely on city parks to recharge, cool off and connect. But climate change is threatening the very spaces that help us cope with the stresses of living on a hotter planet.

New Yorker writer Steve Coll says that though Tillerson has conducted billion-dollar international deals as an oil executive, he has no government experience.

The ant photographs of Mark Moffett, a Harvard-trained ecologist, are often compared to art. He talks with Alex Chadwick about his latest article for National Geographic magazine on the hidden world of one of the most aggressive species of ant.