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The year 2016 will "very likely" be the hottest on record, the UN said today, warning of calamitous consequences if the march of global warming cannot be halted. Average temperatures for the year were set to hit about 1.2 Celsius over pre-Industrial Revolution levels - meaning that 16 of the 17 hottest years on record were this century, said the UN's World Meteorological Organisation (WMO). The new record means the world is already more than halfway to the upper limit of 2 C of warming overall, 1.5 C if possible, which UN nations had agreed upon to stave off worst- case-scenario climate change.