Environment

The Great Lakes are significantly cleaner today, now that many of the region's factories have closed. But environmental challenges -- including pollution and invasive species -- remain.   

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Researchers are refining a system to predict the strength and movement of harmful algae blooms that plague Lake Erie during the summer. The blooms can be dangerous -- fouling beaches and threatening drinking water, especially at the western end of the lake. 

Ben Thorp

Residents near an abandoned military base in Michigan are worried about an unseen invader: toxic chemicals that have contaminated wells in the town of Oscoda. Now the chemicals are spreading farther -- and have even reached Lake Huron.


Veronica Volk

Jon Gee of Environment and Climate Change Canada stands on a platform overlooking a part of the Hamilton, Ontario, harbor called Randle Reef. It's one of the most polluted sites on Canada’s side of the Great Lakes. 

Behind him, water runs from a sewer drain into the harbor. This runoff is cleaner now, but years ago, this would be packed with chemical byproducts from the surrounding steel mills and other factories.

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