Canwest News Service: Even the Great Lakes aren’t great enough to sustain North Americans’ reckless water use in the event of a continentwide water shortage, according to a new report. The report — titled Sentinels of Change and set for release in Friday’s edition of Science — suggests the Great Lakes’ scant renewal rates would not provide enough water to get through a full-blown crisis. “I think we have to stop considering the Great Lakes as the thing that’s going to irrigate the Red River Valley …