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In one day, Ethiopians planted more than 350 million — that's million with an M — trees. It was an effort to combat climate change and deforestation. The program has been dubbed Green Legacy.

Shifts in climate in the Middle Ages likely drove bubonic plague bacteria from gerbils in Asia to people in Europe, research now suggests. Rats don't deserve all the blame.

A huge legal battle is coming over the White House plan to address climate change with additional power plant regulations. The coal industry has the most to lose, and plans to take the EPA to court.

Fish are moving away from the equator and toward the poles to maintain their preferred water temperature. That means, for example, that fishermen are seeing swordfish normally found in the Mediterranean swimming near Denmark. But in the tropics, there are no fish to replace the ones that are leaving.

Demonstrators threw bottles and stones, and police responded by firing water cannons and using pepper spray. Organizers canceled one protest march because of the violence.

A crew plans to leave Nome, Alaska Thursday and sail to the North Pole. The voyage may now be possible due to sea ice melt in the Arctic caused by climate change.

The action star came under fire for saying today's political climate in the U.S. is similar to Nazi Germany's treatment of Jews.

Global Witness, an international human rights group, says a record 227 grassroots environmental activists were killed in 2020. More than half were killed in Colombia, Mexico and the Philippines.

El Niño is coming, which usually means fewer storms. But abnormally warm ocean water makes hurricanes more likely. It's a rare situation

PacifiCorp may have to pay out billions of dollars in damages after being found liable in a series of destructive wildfires over Labor Day weekend in 2020.