Washington Post, "Delaware-size gas plume over West illustrates the cost of leaking methane."

Service roads crisscross the high desert near the Chaco Culture National Park as oil and gas companies race to install new wells. The energy boom in the Southwest is raising concerns about greenhouse gas pollution as well as the possible defacing of ancient ruins of cities built by Pueblo Indian tribes centuries ago.
— http://www.washingtonpost.com/national/health-science/delaware-sized-gas-plume-over-west-illustrates-the-cost-of-leaking-methane/2014/12/29/d34c3e6e-8d1f-11e4-a085-34e9b9f09a58_story.html