Elizabeth Shogren

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This week, the federal government announced a record-breaking $5 billion settlement in a remarkable environmental case. The toxic legacy of the company involved, Kerr-McGee, stretches back 85 years and includes scores of sites across the country.

Kerr-McGee ran uranium mines in the Navajo Nation, wood-treating businesses across the Midwest and East Coast, and a perchlorate plant on a tributary of Lake Mead, the nation's largest reservoir — and it was messy.

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On March 24, 1989, the tanker Exxon Valdez struck a reef in Prince William Sound, Alaska, spilling 11 million gallons of crude oil into the pristine water. At the time, it was the single biggest spill in U.S. history. In a series of stories, NPR is examining the lasting social and economic impacts of the disaster, as well as the policy, regulation and scientific research that came out of it.

Twenty-five years of research following the Exxon Valdez disaster has led to some startling conclusions about the persistent effects of spilled oil.

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The Supreme Court will hear arguments Monday about the Environmental Protection Agency's first-ever greenhouse gas regulations for the biggest polluting facilities.

The case focuses on a 3-year-old requirement that companies get permits anytime they construct new plants or modify existing ones that will emit a lot of greenhouse gases.

EPA's supporters and most of its challengers agree this case is narrow in scope; the court's ruling is not expected to threaten EPA's broader strategy to fight global warming.

People who grow marijuana illegally in the backwoods of Northern California use large amounts of rat bait to protect their plants — and these chemicals are killing several species of wild animals, including rare ones, biologists say.

Here's what happens: The growers plant their marijuana in remote locations, hoping to elude detection. They irrigate their plants — with water from streams — which lures animals looking for water. Rodents chew the flourishing plants to get moisture, which kills the plants. Researchers believe that's the prime reason growers use the poisons.

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