Canary in the coal mine – The Great Lakes

“The Great Lakes in a lot of ways have always been a canary in the coal mine,” Cameron Davis, the senior adviser to the U.S. EPA on the Great Lakes, said last week. “Not just for the region or this country, but for the rest of the world.”

Lake Superior, which is the largest, deepest and coldest of the five lakes, is serving as the “canary for the canary,” Davis said at a public meeting of the Interagency Climate Change Adaptation Task Force last week, pointing to recent data trends.
New York Times, 19 Jul 2010