Few, if any, of their predictions have come true so its hard to believe much of anything they claim!
Lake Superior has increased water temperatures and an earlier onset of summer stratification by about two weeks in just the past 30 years. Within another 30 years Lake Superior may be mostly ice-free in a typical winter.
Lake Erie water levels, already below average, could drop 4-5 feet by the end of this century, significantly altering shoreline habitat.
Global Warming and the Great Lakes – National Wildlife Federation
Centinel2012 