From The Guardian:
Last month was the hottest May globally since records began in 1880, new figures show.
The record heat, combined with increasingly certain predictions of an El Niño, means experts are now speculating whether 2014 could become the hottest year on record.
Data published by the US National Oceanic and Atmospheric Administration on Monday showed the average land and ocean surface temperature last month was 0.74C above the 20th century average of 14.8C, making it the highest on record.
Previously, the warmest May was 2010, followed by 2012, 1998 and 2013.
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