'Extreme year': 2016 declared hottest year on record as climate change builds on big El Nino

By Peter Hannam
Updated January 19 2017 - 10:13pm, first published 9:30pm

The world's major meteorological agencies have declared 2016 to be the hottest year on record - making it three new highs in as many years - as increases in greenhouse gases drove global warming.

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