An iceberg four times the size of Manhattan broke off a glacier in Antarctica
Sep 25, 2017, 2:41pm EDT

A chunk of ice four and a half times the size of Manhattan fell off an Antarctic glacier. This marks the second time in two years that a huge iceberg has calved from the area. The break-off could speed up the loss of more ice, eventually eating away at a barrier that prevents land-based ice from flowing to the sea...

Icebergs calve off Antarctica all the time, but the chunks of ice that broke off Pine Island Glacier are somewhat unusual. The latest iceberg, for instance, cracked off from the center of the ice shelf rather than the sides. That could be because warmer ocean waters are eating away at the ice from beneath, weakening the glacier, the Washington Postsays. Following the recent break-offs, it looks like the glacier is retreating.
Scientists will keep monitoring Pine Island Glacier, as well as other ice shelves that are producing some of the biggest icebergs ever created. The whole of West Antarctica alonemight contribute 10 feet of sea level rise. So if the trend continues, that could spell doom for cities like New York and Miami.