In Pennsylvania, birthplace of the U.S. oil industry, century-old abandoned oil wells have long been part of the landscape. Nobody gave much thought to it when many were left unplugged or filled haphazardly with dirt, lumber and cannon balls that slipped or rotted away.
But the holes — hundreds of thousands of them pockmark the state — are the focus of growing alarm, especially those in close proximity to new wells fracked in the Marcellus shale formation, the nation’s largest natural-gas field. They leak methane, which contaminates water, adds to global warming and occasionally explodes; four people have been killed in the past dozen years.
Continue reading: In the Birthplace of U.S. Oil, Methane Gas Is Leaking Everywhere