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The Colorado River's flow, which provides water to about 40 million people, has dropped by 20 percent over the last century.

Extreme winter weather is forecast to hit the Midwest with temperatures expected to plummet to below zero in some states.

Bear hunting is legal in Oregon, but hunters have to follow guidelines and inform the state's Department of Fish and Wildlife of each kill.

A study by the Indian wildlife conservation charity Wildlife SOS found that 75 percent of the bears' diet consisted of human food waste.

Generating electricity with green hydrogen fuels—predicted to become an important energy source in future—produces practically zero greenhouse gas emissions.