Global sea surface temperatures for both April and May were the highest recorded for these calendar months in a series dating back to 1850, according to the Met Office's HadSST.4.0.1.0 data set. Global sea surface temperatures for both April and May were the highest recorded for these calendar months in a series dating back to 1850, according to the Met Office's HadSST.4.0.1.0 data set. (Met Office Press Office)

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