Colorado toughened up its oil and gas rules. But how tough are they? susancoverAugust 11, 2019 Share This Read the article Click on the title to read the article at its source. Colorado toughened up its oil and gas rules. But how tough are they? Denver Post | Aug 11, 2019 Climate + Energy #COCleanAir, #KeepItInTheGround Share This About the Author susancover | , Read more from susancover Previous Next