While the intensity of reported greenhouse gases has dropped, the study finds some companies, including Hilcorp and ConocoPhillips, are still emitting at a high rate.
Reported oil and gas spills in Colorado jumped a sizable amount last year, to about 1,100, but the increase reflects in part more discoveries of historic rather than new spills
Spills reported to the Colorado Oil and Gas Conservation Commission by oil and gas companies increased sharply last year, but the agency says the increase reflects better regulations that result