Southern Great Lakes forests Southern Great Lakes forests The Southern Great Lakes lowland forests is a temperate broadleaf and mixed forest ecoregion of North America, as defined by the World Wildlife Fund. It lies mostly in the central northeastern United States and extends into southeast central Canada. This area includes the southern half of Michigan's Lower Peninsula, and much of Indiana and Ohio. It also extends through the southern half of Southwest Ontario from Windsor to Toronto and into Pennsylvania and New York on the southern rims of lakes Erie and Ontario. This region is characterized by warm-to-hot summers and mild-to-cold, snowy winters. This
Great Lakes "Since the early 1970s, the level of treatment to reduce pollution from waste water discharges to the Great Lakes has improved considerably. This is a result of significant expenditures to date on both infrastructure and technology, and robust regulatory systems that have proven to be, on the whole, quite effective." The commission reported that all urban sewage treatment systems on the U.S. side of the lakes had implemented secondary treatment, as had all on the Canadian side except for five small systems. However contrary to federal laws in both countries, those treatment system upgrades have not yet eliminated Combined sewer