(Reuters) - Each of the past 12 months ranked as the warmest on record in year-on-year comparisons, the EU's climate change monitoring service said on Wednesday, as U.N. Secretary-General António Guterres called for urgent action to avert "climate hell".
The average global temperature for the 12-month period to the end of May was 1.63 degrees Celsius (2.9 degrees Fahrenheit) above the pre-industrial average - making it the warmest such period since record-keeping began in 1940, the Copernicus Climate Change Service said.
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