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https://i.guim.co.uk/img/media/cc3efc9cdb48822c1f91f61eeab18f22c6bb5264/0_96_6581_3948/master/6581.jpg?width=1200&height=630&quality=85&auto=format&fit=crop&overlay-align=bottom,left&overlay-width=100p&overlay-base64=L2ltZy9zdGF0aWMvb3ZlcmxheXMvdGctb3BpbmlvbnMucG5n&s=287c9272db24eafec7395632e06aa411Away from the brutal main negotiations, there were important strides forward. The science can – and must – rise above politics, says environment writer Geoffrey Lean