Once it lets go, it will trigger an irrevocable chain reaction adding 3 metres to a global rise in sea levels. This would produce an additional 3 metre rise. Warm water currents are carving the ice into terraces and crevices. “Warm water is getting into the cracks, helping wear down the glacier at its weakest points.”The remote submersible detected salt water currents some 2C above freezing. Thwaite Glacier’s ice shelf is like that.
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