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For twenty-seven years, the world's average temperature has been hotter than the average during the second half of the 20th century. Last year, it was the ninth-warmest in recorded history — but still cold for the past ten.

The United Nations' World Meteorological Organization released its annual climate report this week. Compiled using data from NASA, the National Oceanic and Atmospheric Administration, and the UK's Met Office, the group's calculations show the global trend clearly: It's getting warmer.

Below is an approximation of that data, excluding the Met Office's set which wasn't available. The blue line is the NOAA data; the red, NASA. The average of the two is in gray. The zero line represents no deviation from the average global temperature between 1951 and 1980. Anything above zero, then, means the year was warmer than that average.

