A Huge Cave in Kentucky Was a Smelly Disaster. Now It’s Spectacular.

Hidden River Cave was once filled with heavy metals and sewage that made the surrounding town smell awful. After a cleanup, it became a tourist draw.

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Canada Wildfires Cause Poor Air Quality for Toronto, Minneapolis and New York

Wildfires burning in Canada were causing unhealthy air quality across parts of North America on Monday.

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Radioactive Wasps Found at Nuclear Site in South Carolina Could Be a ‘Red Flag,’ Expert Says

Four radioactive wasp nests may indicate previously undetected environmental contamination at the decades-old Savannah River Site. Here’s what to know.

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Trump Taps Climate Skeptics to Attack Science on Global Warming

The agency asked five climate skeptics to write a report criticizing the consensus on global warming. Scientists are pointing out its errors.

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Top U.N. Court Says Countries Must Act on Climate Change

The International Court of Justice called global warming an “urgent and existential threat” at a closely watched case in The Hague.

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Tons of Invisible Plastic Pieces Lurk in Ocean Water

A new study offers the first estimate of nanoplastic pollution in the ocean. There’s a lot.

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Europe Needs Rare Earth Metals. Can a Factory in Seaside France Supply Them?

The continent wants to reduce the risks of depending so heavily on China for the valuable minerals. The question is how.

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E.P.A. Employees Are Invited to Adopt Soon-to-Be Homeless Lab Rats

The agency is cutting animal testing of chemicals. Some scientists are concerned, but in the meantime the rats (and zebra fish) need new homes.

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Debris From SpaceX Explosion, Landing in Mexico, Draws Investigation

Mexican environmental activists say detritus raining down from Elon Musk’s rocket company has caused die-offs of marine life.

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How Heat Waves Can Worsen Air Quality

Scientists are increasingly concerned about the ways extreme heat and air pollution are linked.

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