Environment

The Suncor Energy refinery in Commerce City blew black smoke into the sky as it restarted after planned maintenance on Tuesday morning.

Chevron has proposed building the Cord Federal oil and gas development near Commerce City in Adams County. It is planning a community meeting Tuesday evening before pursuing county and state approval.

Fifty years later, the Big Thompson flood remains one of Colorado’s deadliest natural disasters. The catastrophe prompted changes to emergency response and deeper research into mountain floods.

Metro Denver has seen reservoirs empty and lawns turn brown this summer as cities impose strict outdoor watering restrictions on residents. Denver Water says it’s not saving as much water as hoped.

The Colorado Energy and Carbon Management Commission convened a panel to review three public health studies that found risks associated with fracking. But nothing will come of it.

A new reproducing wolf pack has formed in Colorado’s central mountains, adding to the four packs established in the state. Colorado Parks and Wildlife also released a map showing wolves’ travels.

Record-low snow that plagued Colorado and the West this winter will occur more frequently — and eventually become the norm — as climate change fuels warmer temperatures, according to a new study.

Trappers in Colorado will now be limited in the number of beavers, foxes and other furbearer species they can kill in a day.

Like a game of chess, fire managers try to be one step ahead. New fires are popping up daily as drought and windy conditions plague the western United States.

Fire shelters are a key piece of equipment for wildland firefighters, but their use doesn’t ensure survival.