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Alaska glaciers on the move: Pictured here is the Hubbard Glacier during a calving event. A new study has found a link between abrupt ocean warming at the end of the last ice age and the sudden onset of low-oxygen, or hypoxic, conditions that led to vast marine dead zones. Large-scale warming events at about 14,700, and again at 11,500, years ago occurred rapidly and triggered loss of oxygen in the North Pacific, raising concern that low-oxygen areas will expand again as the oceans warm in the future.
Image credit: SE Alaska Scientific Party
