While summer sun melting the surface of a glacier is the obvious image of a shrinking ice sheet, it isn’t the main way in which Greenland and Antarctica have lost ice.
Most of that ice has left through the edges of melting glaciers, which have been flowing faster and carrying more of the ice into the ocean. An international team combined nearly half a century of satellite records to add up that loss.
Between 1979 and 2023, the two ice sheets lost about 12.5 trillion tons (11.3…
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