Antarctic sea ice shrinks to smallest ever extent

Sea ice around Antarctica has shrunk to the smallest annual extent on record after years of resisting a trend of manmade global warming, preliminary US satellite data has shown.

Ice floating around the frozen continent usually melts to its smallest for the year towards the end of February, the southern hemisphere summer, before expanding again as the autumn chill sets in.

This year, sea ice extent contracted to 883,015 sq miles (2.28m sq km) on 13 February, according to daily data from the US National Snow and Ice Data Center (NSIDC).

World average temperatures climbed to a record high in 2016 for the third year in a row. Climate scientists say warming is causing more extreme days of heat, downpours and is nudging up global sea levels.

At the other end of the planet, ice covering the Arctic Ocean has been at repeated lows in recent years.

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