OF THE
TIMES
©AFP |
Something seems amiss with mighty Superior, the deepest and coldest of the Great Lakes, which together hold nearly 20 per cent of the world's fresh surface water.
Superior's surface area is roughly the same as South Carolina's, the biggest of any freshwater lake on Earth. It's deep enough to hold all the other Great Lakes plus three additional Lake Eries. Yet over the past year, its level has ebbed to the lowest point in eight decades and will set a record this fall if, as expected, it dips 7.6 more centimetres.
Its average temperature has surged about 4.5 degrees Farenheit since 1979, significantly above the 2.7-degree rise in the region's air temperature during the same period. That's no small deal for a freshwater sea that was created from glacial melt as the Ice Age ended and remains chilly in all seasons.