All Too Clear: Beneath The Surface of the Great Lakes
Underwater drones reveal how invasive quagga mussels are reshaping North America's Great Lakes on a scale not seen since the glaciers. By trapping nutrients on the lake bottom, they cause widespread species loss and biological deserts - yet leave unusually transparent waters. Scientists race to control the invaders and discover clearer waters may offer an opportunity to restore an ancient ecosystem.
Duration: 56 minutes and 46 seconds
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