MPR’s Dan Kraker reports on unprecedented algae bloom along the South Shore of Lake Superior. Researchers are trying to figure out the cause. They suspect the bloom may be related to recent historic heavy rains and flooding that washed tons of sediment into the lake. Researchers expect to see more periodic algae blooms in Lake Superior, in part because of that increased water temperature, an effect of climate change.

Algal blooms have become commonplace in other Great Lakes, mainly Lake Erie, as well as inland lakes around Minnesota and the Midwest. But they only started appearing in Lake Superior in 2012.