Wirth first became involved with climate change activism through his friendship with another early believer, Carl Sagan.
Energy and Environment
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A replacement rule from the Interior Department rescinds mandates for companies to reduce gas pollution.
More than plastic bags or straws, microplastics are perhaps the most pervasive kind of plastics pollution.
Craft brewers say it’s their duty to protect the water they use. Beer is about 90 percent water, after all.
Dropsondes may just look like paper towel tubes, but they're responsible for predicting hurricane patterns and saving lives.
Record-breaking heat last week and over the weekend hasn't helped firefighters battling wildfires across the state.
If passed, Proposition 112 will increase the minimum distance between new wells and homes, offices, rivers and playgrounds to 2,500 feet.
Members of Colorado Task Force One were working in North Carolina.
Ute Peak Solar and Standard Solar want to see the plant built at a substation in western Montrose County.
Congressman Jared Polis asked the federal government to keep Rocky Flats National Wildlife Refuge closed. Fish and Wildlife plans to open the refuge regardless.
Officials say a controlled, safe shooting range is better than people shooting elsewhere.
Hot and dry weather with windy conditions helped make this the worst fire season in Colorado since 2002.
Roads And Bridges Have Been Rebuilt, But Lyons Still Struggles To Recover Community Lost In The Floods
Five years on, affordable housing options remain scarce, and many have been forced to leave their hometown.
Bob Brakenridge studied floods half a world away. Then one struck in his own backyard.
Loni Gaudet answered Colorado Matters listener questions, including caring for cacti and preparing for winter.