If you lived in Michigan in the 1960s and '70s, you will remember: Lake Erie was on the "critical list." It was once declared dead.
But it got back on the road to health and recovery until the mid-1990s.
That's when the lake started showing signs of distress, with large cyanobacteria blooms (sometimes referred to as blue-green algae blooms) and dead zones showing up again.
Now comes a report from an international agency that keeps a close eye on the health of the Great Lakes, and it is a clarion call to action. Among the agencies contributing to the report is the Graham Sustainability Institute at the University of Michigan.
Don Scavia, director of the Graham Sustainability Institute, joined us today.
Listen to the full interview above.
Clarification: An earlier version of this story referred to "algae blooms" in Lake Erie. These are really bacterial blooms (cyanobacteria) that look like algae. The copy has been clarified above.