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The original was posted on /r/todayilearned by /u/KnightTrain on 2024-11-22 22:40:28+00:00.

Original Title: TIL Canada had an ancient glacial lake the size of the Black Sea, contained by an ice sheet. When the ice sheet broke ~9000 yrs ago, the lake drained and dumped enough water into the Atlantic to raise sea levels by 3-9 ft, cool the entire Northern Hemisphere by ~3C, and turn Britain into an island.