Canada on Monday formally invoked a 1977 treaty with the United States to request bilateral negotiations over Enbridge Inc’s (ENB.TO) Line 5, escalating a long-running dispute over one of Canada’s major oil export pipelines. Line 5 ships 540,000 barrels per day of crude and refined products from Superior, Wisconsin, to Sarnia, Ontario, but the state of Michigan ordered Enbridge to shut it down due to worries a leak could develop in a four-mile section running beneath the Straits of Mackinac in the Great Lakes. Enbridge ignored Michigan’s order and the sides are embroiled in a legal battle. The government of Canada has been […]