London — Climate scientists have warned that 2020 could be the world’s hottest year on record, with September temperatures eclipsing previous highs and Arctic ice retreating from the seas it usually covers.

Global year-to-date temperatures show little deviation from 2016, the warmest calendar year recorded so far, Europe’s Copernicus Climate Change Service reported on Wednesday. Climate patterns such as La Niña in the Pacific Ocean, occurring for the first time in eight years, could determine whether this year turns out to be the warmest on record, according to the researchers...

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