We could cross a global warming red line by 2022

Within the next five years, global average surface temperatures may temporarily breach a key guardrail set out by the Paris Climate Agreement, according to a new report from the U.K. Met Office. 

The report warns that global average temperatures are "likely" to exceed 1 degree Celsius, or 1.8 degrees Fahrenheit, above preindustrial temperatures within the next five years. The past three years, which have been among the warmest on record for the planet, have exceeded that mark, the Met Office said. 

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