In May 2012, Hanson and Michael Rowe noticed an overpowering smell, like rotten eggs, seeping from an abandoned gas well on their land in Kentucky. The fumes made the retired couple feel nauseous, dizzy and short of breath.

Regulators responding to the leak couldn’t find an owner to fix it. J.D. Carty Resources LLC had drilled the well near the Rowes’ home in 2006 — promising the family a 12.5 percent royalty and free natural gas, which they never got. But Carty went bust in 2008 and sold the site to a company that was later acquired by Blue Energy LLC. Lawyers for both companies deny any responsibility for the leak.

A year later, Kentucky's Division of Oil and Gas declared the well an environmental emergency and hired Boots & Coots Inc. — the Texas contractor that doused oil-well fires after the Gulf War — to plug it. During the 40-day operation, the Rowes retreated to a trailer on their property and lived with no running water to escape the gases and noise. Regulators determined the leak was a toxic blend of hydrogen sulfide, a common drilling byproduct, and the potent greenhouse gas methane.