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Why 2023 is shaping up to be the hottest year on record   Spiking temperatures in the world’s oceans and the arrival of El Niño weather conditions in the Pacific mean that 2023 is shaping up to be the hottest year on record, with researchers saying the planet is entering “uncharted territory”. London saw high temperatures on 9 June 2023  Guy Corbishley/Alamy David L. Ryan/The Boston Globe via Getty Images Exceeding 1.5°C of global warming could accelerate the melting of polar ice caps Sebnem Coskun/Anadolu Agency/Getty Images The  previous hottest year on record was 2016 , which is also when the world was last in a warming El Niño weather pattern (although some agencies say 2020 also tied for the top spot). Now, temperature records this month suggest 2023 could be tracking close to 2016. The first 11 days of June registered the highest global temperatures on record for this time of the year, according to Copernicus, the European Union’s Earth observation programme, follow...