Reuters: Hydraulic fracturing can cause nearby abandoned oil wells to leak methane, according to a study published on Tuesday in the peer-reviewed Water Resources Research journal, marking a potentially large source of unrecorded greenhouse gas emissions.
Researchers at the University of Vermont examined a part of New York state overlying the Marcellus shale gas reservoir to determine the chances that a newly fracked well there would intersect one of the state's thousands of existing wellbores.
"Average...