Muskegon Chronicle: A new study blames a post-1998 plunge in upper Great Lakes water levels on changing climate patterns — not a manmade “drain hole” sucking lake water out the St. Clair River. So there’s no need to plug the leak … for now. But global warming might make a St. Clair fix necessary in the future. Those are the preliminary conclusions of a draft report published recently as part of a massive study of Great Lakes water levels. West Michigan residents will have a chance to …