The report says scientists don't know enough about the effects on wildlife.
Oil and Gas
Activists are pushing to bring their quest to limit oil and gas development to the voters.
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.
Gov. John Hickenlooper had worked with a team of "willing partners" on legislation that would have granted more control to local municipalities.
The governor is trying to broker a deal to avoid ballot measures restricting drilling. A key interest group signed on amid controversy, but some legislators are unsupportive.
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.
Industry officials say restrictions will cost jobs.