Great Lakes Areas of Concern rivers, and oceans causing pollution and buildup of sediment. Nonpoint source pollution is said to be the most problematic and hardest to reverse of the types of pollution because it is so hard to regulate and pinpoint where it originates. Many experts agree that nonpoint source pollution is the biggest concern facing the Great Lakes. With the increase of urbanization, a toll has been taken on the lakes in these areas. Lakes that once had stable ecosystems with the appropriate amount of plant life are now full of massive amounts of plants and algae that have been fed by excess
Great Lakes Areas of Concern just the past three years. There are many examples of this problem in each of the Great Lakes, as well. The Great Lakes have been damaged by more than 180 invasive and non-native species. Some of these species include the zebra mussel, quagga mussel, round goby, sea lamprey, and alewife. Invasive plants include purple loosestrife and Eurasian watermilfoil. As well as throwing off the habitats of native species and the food web of the ecosystem, invasive species also threaten human health and have a major negative impact on the Great Lakes economy by damaging fisheries, agricultural industries, and tourism. Point-source