Where did all the Antarctic sea ice go?
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b'In February, the floating sea ice around Antarctica hit a record low for the second year running. But the moderate alarm from scientists at that record low is now being overlaid with astonishment \\u2013 with some scientists worried they could be witnessing the start of a slow collapse of the delicate southernmost ecosystem. Guardian Australia environment reporter Graham Readfearn and oceanographer Dr Will Hobbs tell Laura Murphy-Oates about why this melting is happening, and the major knock-on effects for the rest of the planet'