Geneva — Ocean heat hit a record high in 2018, the UN said on Thursday, raising urgent new concerns about the threat global warming is posing to marine life. In its latest state of the climate overview, the World Meteorological Organisation (WMO) reaffirmed that the last four years have been the hottest on record — figures previously announced in provisional drafts of the flagship report. But the final version of the report highlighted worrying developments in other climate indicators beyond surface temperature. “2018 saw new records for ocean heat content in the upper 700m metres,” a WMO statement said. The agency said the UN had data for heat content in the upper 700m of the ocean dating back to 1955. Last year also saw new heat records for the ocean’s upper 2,000m, but data for that range only goes back to 2005. The previous records for both ranges were set in 2017. About 93% of excess heat — trapped around the Earth by greenhouse gases that come from the burning of fossil fuels ...

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