The alert is in effect through 4 p.m. on Tuesday.
Activists are pushing to bring their quest to limit oil and gas development to the voters.
The report says millions of people’s drinking water is at risk over the next few decades if demand continues to outpace the Colorado River’s water supply.
The Colorado Oil and Gas Conservation Commission announced Thursday that the well east of Greeley has been determined to be "potentially related" to two small earthquakes in May and June.
The governor spoke out a day after he abandoned the effort to find a legislative compromise to keep the measures off the November ballot.
The EPA intends to clarify which waterways are “Waters of the United States," to reduce confusion around the Clean Water Act. But critics fear the recent proposal is a power grab that could hurt farmers, ranchers and possibly the energy industry.
A new study links the spike in earthquakes in central Oklahoma to huge amounts of wastewater pumped underground by oil and gas operators.
The price of renewable energy from solar and wind is beginning to compete with fossil fuels.
This spring, the Colorado River flowed through Mexico after running dry for decades. Photographer Pete McBride was one of the few people to experience it by boat.