Ice cover is highly variable. Lake Michigan has had as much as 93% of its surface covered, in 2014, while in 2002 coverage hit a low of 12%. But as human action, largely the burning of fossil fuels, drives climbing temperatures, there are now fewer days with ice cover and coverage is decreasing at a rate of about 5% per decade. Lake Michigan’s decline is less severe, while Lake Superior — among the fastest-warming lakes on the planet — has seen the fastest loss.
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