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https://i.guim.co.uk/img/media/84137661c7b2b21da55900df07f67769d456128d/0_262_5500_3300/master/5500.jpg?width=1200&height=630&quality=85&auto=format&fit=crop&overlay-align=bottom,left&overlay-width=100p&overlay-base64=L2ltZy9zdGF0aWMvb3ZlcmxheXMvdGctZGVmYXVsdC5wbmc&s=b31762d11c3394602611160d57d1d9caDeep divides remain after high-stakes talks end with agreement to help developing world shift to low-carbon economy