Too hot for comfort (or complacency)

The figures are now official, 2015 was the hottest year on record:

    Global surface temperature in 2015 was +0.87°C (~1.6°F) warmer than the 1951-1980 base period in the GISTEMP analysis, making 2015 the warmest year in the period of instrumental data.
    Global temperature in 2015 was +1.13°C (~2.03°F) relative to the 1880-1920 mean.

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