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Worries are growing among environmentalists in Brazil, who say an indigenous leader in the Amazon was killed after gold miners invaded the area.

Massive blooms of blue-green algae are choking Florida's waterways. On Lake Okeechobee, the Army Corps of Engineers is testing methods based on wastewater treatment to remove the green slime.

One increasingly popular water sport — wake surfing — is causing some to question its safety and its environmental impact on lakes.

President Trump signed a "national energy emergency" that gives his administration new powers to boost fossil fuel development around the country.

A massive project headed by Elon Musk in Memphis, Tenn., to power AI has moved at breakneck speed. But it's stirring controversy around pollution emissions. The EPA says it's looking into it.

Scientists who warned of heat waves and rising seas this week also say that it's possible to avoid the worst effects of the warming climate. They're relying on computer models of the world economy.

A report shows rapid development of new cancer treatment and detection is helping people live longer. But more people are also getting diagnosed, and at younger ages.

Less than 24 hours after misleading claims started circulating that tied Politico to USAID, the White House vowed to end subscriptions for the insider news outlet's services and others.

The EPA is finalizing a rule to require replacement of lead service lines that connect homes to water systems. The change would lower lead levels in drinking water but poses logistical challenges.

High levels of lead were found in a surprisingly large number of Bangladeshi kids in New York City — and in pregnant women in Bangladesh. Could there be a common cause?