Sen. Cory Gardner led questioning of the EPA's response to the mine spill.
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The EPA says wastewater is still spilling out of the mine at about 600 gallons per minute.
Across Colorado’s national parks there’s an estimated $205 million maintenance backlog.
In 40 states, use of coal as a power source (as a share of all power sources) has dropped since 2004. Many of these states are increasingly relying on natural gas instead.
Montana has one of the heaviest lifts of any state to comply with the EPA's plan to reduce carbon emissions. But the state is also rich in renewable energy, and the regulations may be a boon to some.
Republicans accused the EPA of not scrutinizing its own actions as closely it would a similar incident caused by private enterprise.
An unprecedented collection of stakeholders across 11 states is working to save the bird’s population before the federal government steps in.
In Colorado, 36 species of flora and fauna are listed under the Endangered Species Act.
The Gunnison sage grouse was listed as threatened last November. That experience may offer some lessons about the greater sage grouse.
Enos Mills led the campaign for the park's founding. Historical actor John Stansfield recalls Mills' story -- in character.
It's not just recent wildfire smoke that's caused dozens of air pollutant advisories so far this year.
Workers were delayed in issuing a warning about the spill because they were trying to escape it, documents say.
An agency report also found that "underestimation of the water pressure" in the mine was likely the most significant factor relating to the blowout.
It's a reversal for local officials who long feared that designation as a federal Superfund site would harm economic development.