The document summarizes the 2012 amendments to the Great Lakes Water Quality Agreement (GLWQA). Some of the key changes included expanding the scope to address new issues like climate change impacts and groundwater, increasing emphasis on pollution prevention, and establishing a new Great Lakes Executive Committee to advise the parties. The amendments also retained existing approaches for areas of concern, lakewide management of chemicals of mutual concern and nutrients, and principles like virtual elimination of toxic substances. Implementation will occur through continued binational coordination and each country's domestic mechanisms like the Clean Water Act in the US.