This story was published by FairWarning , a nonprofit news organization based in Los Angeles that focuses on public health, safety and environmental issues. As the dim early light washed over the Appalachian countryside, Jason Kingsley began his climb up the side of an 80-foot silo. Kingsley was not a morning person. But he was also broke and unemployed. So when a dairy farmer named Ronald Wood called to ask him to help to rescue a piece of machinery that had accidentally been buried under tons of hay and legumes, Kingsley said yes. Not long before, Kingsley, 26, had been making good money in the Pennsylvania natural gas fields that dot the Marcellus Shale. But the work dried up, and he was forced to move back to his father’s house in the little town of Mansfield in the far north central part of the state. In the silo, Kingsley’s boots crunched on the mixture of wet hay and legumes used to feed Wood’s dairy cows. Wielding pitchforks, he and another worker, Eric Stone, toss...