Inter Press Service: The weather was right for swimming this summer along the shores of Lake Michigan, but on many days, the only living things seen on the beach were gulls, picking away at zebra mussels ensnared in a thick, green slime that covered every rock, pebble and grain of sand for miles. The slime is Cladophora, a native algae that over the last few years morphed from a well-behaved algae into a green monster that fouls drinking water and beaches, and clogs industrial intake pipes in Lake …