Temperature data for 2016 shows it is likely to have edged ahead of 2015 as the world's warmest year. Data from Nasa and the UK Met Office shows temperatures were about 0.07 degrees Celsius above the 2015 mark. Although the Met Office increase was within the margin of error, Nasa says that 2016 was the third year in a row to break the record. The El Niño weather phenomenon played a role, say scientists, but the main factor was human emissions of CO2. The latest conclusions won't come as a much of a shock to observers, as the likely outcome was trailed heavily towards the end of last year. Animation: Climate change explained in six graphics

 

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