By Ray García
Algae pollution, plastic pollution and waste run-off plague the Great Lakes here in the United States. But similar problems also threaten large bodies of freshwater worldwide. The seven African Great Lakes and Lake Baikal in Russia, two of the world’s largest systems of freshwater, also face these problems daily. During the summer, a rapid growth of algae is among the most prominent challenges in Lake Erie and Lake Michigan. These algal blooms harm the lake animals and can harm humans as well.