Grace Hood

There's word a treasure box filled with gold and gems and hidden in the mountains a decade ago has been found. That's left a passionate community of tens of thousands of hopeful hunters in mourning.

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.

Last August, 3 million gallons of orange wastewater flooded into Colorado's Animas River, ending up in Lake Powell. But Congress has failed to come up with a way to stop this from happening again.

Climate change is affecting what visitors see in Mesa Verde National Park. Over the past decade, scorching wildfires have destroyed archaeological artifacts — and have also revealed new ones.

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 entrance fees at some national parks increase on Thursday. It will help with upkeep of restrooms and trails, but it's likely to be a drop in the bucket.

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.