On September 7th Antarctica’s sea ice covered just short of 17m km, according to data tracking its daily extent from America’s National Snow and Ice Data Centre (nsidc). That is 1m sq km below its previous smallest annual maximum in 1986—an area equivalent to two Spains. Meanwhile, in the Arctic, where ice has been melting during the northern hemisphere’s summer, sea ice is at its sixth-lowest level since records began in October 1978.
A recent study published in Nature Communications suggested that the first ice-free summer month in the Arctic could come in the 2040s, even if the world reduces greenhouse-gas emissions quite steeply.
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