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.

Climate change has become a top issue for Democratic primary voters. But it's not clear if the politically divisive topic will play as big a role in the general election.

The Trump administration wants to defang the National Environmental Policy Act. At a public hearing in Denver, the law's defenders faced off with federal officials and business interests.

More cities, states, and even utilities are pledging to shift to all renewable energy. But experts say the nation's power grid needs a lot of changes to make that happen.

After years of tension over expanded oil and gas drilling, including a deadly explosion that galvanized critics, the state is moving to tighten regulations on the booming industry.

Colorado's incoming governor Jared Polis is among a number of state Democratic leaders pledging more action on climate as the Trump administration pulls back.

As drought has deepened across the West, much attention is paid to a colorful map that shows the hardest-hit areas. The scientists who update the map each week face enormous pressure to get it right.

A ballot measure would keep new oil and gas wells 2,500 feet away from homes and schools, the strictest setback in the nation. The oil and gas industry says that threatens its very existence.

In Colorado, residents of Pueblo are concerned renewable energy jobs will not be as well paying as the ones in the nearby coal plant.

Signatures for ballot initiatives — one by advocates for residents opposed to fracking; the other by advocates for landowners seeking to protect mineral rights — have been submitted to officials.

Dry conditions are causing holiday fireworks celebrations to be canceled. A geography professor at the University of Colorado Boulder says the single biggest day for wildfires to start is July 4.

After decades of modern fire prevention some forests are much thicker than they've been historically. New research offers a guide to thinning that could keep wildfires smaller and shorter.

Record-low snowfall in some parts of the Rocky Mountains this winter isn't just bad for the ski industry. It's also a real problem for water managers throughout the western United States.

The U.S. solar industry is bracing for possible tariffs or quotas on imported solar panels. Such action could have very different consequences on different parts of the industry.

Growing marijuana takes a lot of energy, which comes into conflict with state efforts to reduce greenhouse gases. Now, some places are helping the pot industry to become more energy efficient.

Since President Trump pulled out of the Paris climate deal, more cities are vowing to shift to 100 percent renewable power. We visit Aspen, Colo., to see how complicated that can be.

President Trump's proposed budget would cut money for climate research that measures a warming world. We tag along to see how air samples are collected on a Colorado mountaintop.

The Energy Star program saves consumers billions of dollars a year by boosting products' efficiency. But in his effort to shrink the size of government, President Trump wants to eliminate the program.

Appliance makers and home builders are in Washington, D.C., to celebrate the energy efficiency program. Energy Star is among 50 EPA programs that would be eliminated under the president's budget plan.