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Scientists say the average surface temperature of the world's oceans is at a record high. It's now 20.96 degrees Celsius, compared to the previous record of 20.95 in 2016. The numbers come from the EU's climate change service, Copernicus.

Dr Samantha Burgess, the Deputy Director of the Copernicus Climate Change Service, told Newshour's Owen Bennett-Jones, "the reality is that over last four months, the globe as a whole has seen a long period of unusually high sea surface temperatures... it's really a cause for concern."

(Picture: Dead fish lie on the beach in Chumphon, Thailand June 22, 2023. Credit: Kantaphong Thakoonjiranon /via REUTERS)