Grace Hood

More than a decade ago, the issue seemed distant to Americans' experiences. But now polls show a dramatic rise in concern, driven partly by extreme weather.

Many cities are converting to LED streetlights. The move can help restore darker skies and make stars visible again, and they also save energy and money. But some LEDs emit light that disrupts sleep.

Methane is a powerful greenhouse gas, and on Thursday the Obama administration laid out new regulations to stop methane leaks from the oil and gas industry. A report from Colorado explains how that state has brought methane emissions under control.

The U.S. Fish and Wildlife Service announced Tuesday the greater sage grouse does not need protections under the Endangered Species Act. The move is being celebrated by Western states and industry stakeholders because they say a listing would cost them billions of dollars in economic activity. But some environmental groups say the bird should be listed as endangered, and they plan to file lawsuits.

Colorado will need more water to supply the state's fast-increasing population. So two large reservoir projects have been proposed, but some Coloradans worry about the dams' possible ecological harm.

An estimated 3 million gallons of orange fluid that spilled from the Gold King Mine in Colorado has traveled from the Animas River in Colorado to the San Juan River in New Mexico.

Boulder, Colo., is home to a large number of non-essential workers furloughed by the government shutdown. The economic impact is beginning to be felt in the city as the political standoff has continued. It is now in its 11th day.

Flooding in Colorado has taken a toll on the state's small businesses. In the small town of Lyons, the road to recovery looks especially long. Businesses there not only need to repair damage, but also stay afloat for as long as six months without much of their customer base. That's because damaged water and sewage lines have made many parts of town unlivable.

Colorado flooding has prompted an unprecedented challenge for the state's oil and gas industry. The practice of hydraulic fracturing is widespread along the state's Eastern Plains, but overflowing rivers have swept away equipment and caused more than 37,000 gallons of oil to spill into or near rivers.

With several gun control measures now law in Colorado, four gun-related companies say they will make good on plans to move some or all of their operations out of the state. Hunting outfitters are also worried about fallout from a boycott by out-of-state clients.