MARQUETTE, Mich. ? As the research boat bobs up and down on grey, choppy Lake Superior, Michigan Tech University chemist Noel Urban and two students drop a metal cylinder over the side to retrieve a water sample from the bottom.
They are measuring carbon dioxide content ? an unspectacular statistic by itself, yet an important piece of a highly complex puzzle.
globeandmail.com: The mystery of Lake Superior’s low levels, surging temperatures