The Globe and Mail reports in its Monday, Aug. 3, edition that the Michigan Supreme Court has ordered state regulators to revisit a key permit for an oil pipeline tunnel under the Great Lakes. An Associated Press dispatch to The Globe reports that the 6-1 decision raises uncertainty for the 73-year-old Line 5 pipeline, owned by Enbridge. Line 5 runs six kilometres beneath the Straits of Mackinac. Enbridge plans to tunnel the pipeline under the straits, but environmentalists and Michigan Governor Gretchen Whitmer advocate for relocating it entirely. The Michigan Public Service Commission granted a permit to build the tunnel in 2023. Four Michigan tribal nations along with several environmental groups sued. The Michigan Supreme Court ruled Friday that when they granted the permit, regulators failed to consider if the tunnel project will extend the lifetime of the pipeline, resulting in more harm to the environment. The ruling said the Public Service Commission was inconsistent in comparing alternatives with the pipeline, such as trucks or trains, and failed to evaluate the tunnel's potential impact on fishing, boating and other public trust rights on the Great Lakes. Enbridge says it is reviewing its legal options.