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The Great Lakes--Erie, Huron, Michigan, Ontario, and Superior--hold 20 percent of the world's supply of surface fresh water and provide sustenance, work, and recreation for tens of millions of Americans. But they are under threat as never before, and their problems are spreading... Read Full Overview

The Great Lakes--Erie, Huron, Michigan, Ontario and Superior--hold 20 percent of the world's supply of surface fresh water and provide sustenance, work and recreation for tens of millions of Americans. But they are under threat as never before, and their problems are spreading... Read Full Overview