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What Is the UNFCCC and Why Is the U.S. Pulling Out?

The Trump administration said Wednesday that the United States was withdrawing from 66 international agreements, including a major climate change treaty.

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Trump Pulls Out of Global Climate Treaty

The action could make it more difficult for a future administration to rejoin the Paris climate accord, the agreement among most nations to fight climate change.

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New Dietary Guidelines Abandon Longstanding Advice on Alcohol

Now the government’s recommendation is to “limit” drinking, without specifying safe amounts for men and women. The guidelines no longer warn of risks like cancer.

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Venezuela’s ‘Dirty’ Oil and the Environment: Three Things to Know

Most of the reserves in the country are extra-heavy oil that’s tough to extract and generates more greenhouse gases.

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The Bat Woman of North London: ‘It’s Like Tuning In to Another World’

On night walks through Highgate Wood, Cindy Blaney shares the whirling wonder of the often-maligned mammals with the humans below.

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The Year in Neanderthal Discoveries

They drew with crayons, possibly fed on maggots and maybe even kissed us: Forty millenniums later, our ancient human cousins continued to make news.

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The Trump Administration Approved a Big Lithium Mine. A Top Official’s Husband Profited.

Karen Budd-Falen, the No. 3 at the Interior Department, didn’t disclose a $3.5 million water-rights contract between her husband and the developers of a Nevada mine, records show.

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In the Arctic, Drones Help Identify Deadly Virus in Whales

Scientists took samples from whale blow, identifying possible disease risks for marine mammals in northern seas.

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Offshore Wind Projects Challenge Trump Administration’s Order to Stop Work

The developers of Revolution Wind off Rhode Island and Empire Wind off New York are the latest to sue the Trump administration.

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A Study Is Retracted, Renewing Concerns About the Weedkiller Roundup

Problems with a 25-year-old landmark paper on the safety of Roundup’s active ingredient, glyphosate, have led to calls for the E.P.A. to reassess the widely used chemical.

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