Lake Superior has increased water temperatures and an earlier onset of summer stratification by about two weeks in just the past 30 years. Within another 30 years Lake Superior may be mostly ice-free in a typical winter.

Global Warming and the Great Lakes – National Wildlife Federation

Reality has a different opinion, with Great Lakes ice obliterating records two years in a row, and eight foot thick ice blocking shipping.

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U.S. Coast Guard Working to Clear Path Through Ice – Northern Michigan’s News Leader

Meanwhile, Mark Serreze focuses on writing Arctic propaganda of no scientific value.