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Blue-green algae on western Lake Erie on September 26, 2017. The border between the United States and Canada runs down the centre of the lake. Landsat 8 image. Source:

The natural  history of Lake Okeechobee, at 730 square miles the largest lake in Florida, is intimately entwined with that of the surrounding Everglades. Before the twentieth century, water from the north would drain into the lake, and when the water level rose high enough, it would “sheet-drain” into the southern Everglades.… Read the rest “BLUE-GREEN ALGAE: THE GOOD, THE BAD, AND THE UGLY”