Federal regulators on Friday released a long-awaited draft study that found that most of the environmental effects resulting from constructing a tunnel to house Line 5 beneath the Straits of Mackinac would be temporary and tied almost exclusively to construction activities. The tunnel, the study found, would have a "beneficial cumulative effect" on reducing the risk of a crude oil leak from the pipeline. More at the link in bio. #detroitnews #line5 #line5tunnel #mackninac