How we measured air quality at the I-70 cover park in Denver’s Elyria-Swansea neighborhood
The park was built to reduce pollution levels in Elyria-Swansea. Our reporters tested whether the air quality is actually improved.
Why do small airports still use fuel containing lead?
People living near Rocky Mountain Metropolitan Airport in Broomfield won a major victory this month. The facility announced it would eliminate leaded gasoline by 2027, three years ahead of a federal target date.
By Sam Brasch
Colorado loses bid to build a federally funded regional hydrogen hub
The federal government funded seven regional projects across the country, but it rejected a multi-state coalition in the Rocky Mountain West.
By Sam Brasch
Colorado already has statewide e-bike rebates. It’s now launching grants to help communities start their own
The state wants to help a hundred local e-bike programs bloom.
By Sam Brasch
Xcel Energy delays project to deliver hydrogen to natural gas customers near Hudson, Colo.
Xcel says mixing hydrogen into the natural gas supply is a way to cut climate-warming emissions. Residents and environmental groups aren’t buying it.
By Sam Brasch
It’s official: Oregon will supply wolves for Colorado’s reintroduction project
The agreement removes the final roadblock to the state’s ground-breaking reintroduction plan.
By Sam Brasch
Why windows remain one of the clearest climate solutions in the U.S.
U.S. windows have come a long way since the 1970s, but they remain a global laggard when it comes to efficiently holding back the elements.
By Sam Brasch
Colorado approved new climate rules for manufacturers. Environmental groups worry they will let companies increase pollution
The fight marks the latest battle between Gov. Jared Polis and environmental justice advocates.
By Sam Brasch
Colorado considering new industrial emissions limits. Environmentalists want to scrap them and start over
In a letter released Tuesday, a coalition of environmental groups says corporate carveouts have made the regulations worthless.
By Sam Brasch
Federal government signals approval for Colorado’s wolf reintroduction plan
A draft decision released Friday would grant Colorado permission to harass or kill gray wolves in certain cases.
By Sam Brasch
$22 million worth of trees are coming to Colorado
Deputy Agriculture Secretary Xochitl Torres Small made the announcement in Aurora Thursday.
Here’s where Colorado will likely get its future wolves
The state could host transplanted predators from Oregon, Washington and the Nez Perce Tribe in Idaho, but some sources might not be ready by a voter-mandated deadline.
By Sam Brasch
Fossil fuel advocates revive ballot measure to prohibit local gas bans in Colorado
A leading oil and gas group has dropped similar efforts once environmentalists pulled initiatives to restrict drilling.
By Sam Brasch
Federal judge pauses Uinta Basin Railway project that would ship millions of gallons of oil through Colorado
The ruling finds the Surface Transportation Board’s approval of the Uinta Basin Railway project was flawed and ignored potential environmental damage.
Xcel Energy customers can expect higher electricity bills starting in September
Regulators approved a $96 million rate hike for the state’s largest utility, tacking on an extra $4 per month for the average residential electricity customer.
By Sam Brasch
This Colorado-built satellite will leave methane polluters nowhere to hide
The Environmental Defense Fund says MethaneSAT, set to launch next year, is a new frontier for climate accountability.
By Sam Brasch