Alliance for the Great Lakes Lake Michigan lake bottom by the Illinois legislature to a prominent Chicago university, despite disagreement about the move from other environmental organizations. Decades later, the case "Lake Michigan Federation v. U.S. Army Corps of Engineers" is a seminal decision under the Public Trust Doctrine, which prohibits the sale of public Great Lakes resources to private entities. In 2002 and again in 2008, the Alliance helped write and partner with business interests to pass the Great Lakes Legacy Act to fund Area of Concern cleanups. It helped write and pass the Great Lakes Basin Water Resources Compact to set water conservation
Great Lakes during the 1970s and 1980s, combined with successful salmonid stocking programs, have enabled the growth of a large recreational fishery. The last commercial fisherman left Milwaukee in 2011 because of overfishing and anthropogenic changes to the biosphere. Since the 19th century an estimated 160 new species have found their way into the Great Lakes ecosystem; many have become invasive; the overseas ship ballast and ship hull parasitism are causing severe economic and ecological impacts. According to the Inland Seas Education Association, on average a new species enters the Great Lakes every eight months. Introductions into the Great Lakes include the