Far out on Douglas Lake in northern Michigan, a crew of limnologists (the fresh-water equivalent of oceanographers) in a boat raised core samples from the bottom and tested the oxygen content of the deep. The results, carefully evaluated in the laboratory on shore, were disturbing. At 10,000 years of age, Douglas Lake was past its prime, and slowly dying. In a few more thousand yearsa mere split-second in geological timethis haunt of fishermen will be gone, with nothing but a bog to mark its grave.
In the view of Indiana University Limnologist David Frey,...
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