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Parts of the Front Range hit 100 degrees over the weekend, then woke up to snow on Tuesday. Meteorologists will track whether the enormous swing set a new record in the U.S.

Extreme heat across the western U.S. is creating huge challenges for keeping the lights on in California. Experts say it shows states need to be planning for climate change extremes.

The Trump administration says only the federal government can set tailpipe emissions standards. It's the latest move in a months long standoff over efforts to weaken a key Obama-era climate rule.

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.