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ADELAIDE, AUSTRALIA - DECEMBER 19: Adelaide residents sunbathe on Henley beach on December 19, 2015 in Adelaide, Australia. Adelaide is experiencing an extreme heatwave, with temperatures reaching over 40 degrees for five consecutive days. (Photo by Morne de Klerk/Getty Images)

ADELAIDE, AUSTRALIA - DECEMBER 19:  Adelaide residents sunbathe on Henley beach on December 19, 2015 in Adelaide, Australia. Adelaide is experiencing an extreme heatwave, with temperatures reaching over 40 degrees for five consecutive days.  (Photo by Morne de Klerk/Getty Images)