Great Lakes passenger steamers had to divest themselves of their marine divisions on the lakes. Under this divestiture law, the "Milwaukee Clipper", for instance, was sold by the Anchor Line along with four other railroad-owned company fleets to the newly formed Great Lakes Transit Corporation. Under this flag, the "Clipper" carried passengers along her old route until retired in 1970. Before trains and, later, cars became prevalent, summer vacation areas in more remote areas around the Great Lakes were accessible primarily only by steamer. Northern Michigan's tourist and resort areas began to grow in this manner in the late 1890s. In the late 19th
Great Lakes U.S. side highlight five large municipal systems (those of Detroit, Cleveland, Buffalo, Milwaukee and Gary) as being the largest current periodic sources of untreated discharges into the Great Lakes. Algae such as diatoms, along with other phytoplankton, are photosynthetic primary producers supporting the food web of The Great Lakes. The changes in the size or in the function of the primary producers may have a direct or an indirect impact on the food web. Photosynthesis carried out by diatoms comprises about one fifth of the total photosynthesis. By taking CO2 out of the water, to photosynthesize, diatoms help to stabilize