Michael Elizabeth Sakas
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As the warming climate makes extreme fires more likely, some iconic tree species are not growing back like they used to. Ecologists say this could transform vast areas of western forests.
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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.
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Winters are warming faster than summers in many places, and colder parts of the U.S. are warming faster than hotter ones. The warming winter climate has year-round consequences across the country.
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There's new concern that the growing cannabis industry may be contributing to air pollution. But it's a tricky thing to study, since pot is still illegal under federal law.
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A young teenager in Colorado has been named one of Forbes 30 under 30, a list made up of the "brashest entrepreneurs" in the U.S. and Canada.
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The weeks after the Columbine High School's deadly shooting saw waves of activism from students and parents concerned about gun access.