BBC: The UN’s top climate official has given an upbeat assessment on the prospects of a global deal at a climate summit which opens in Copenhagen on Monday. Yvo de Boer told the BBC things were in “excellent shape” as officials from 192 nations began gathering in Denmark. Any agreement is intended to supplant the 1997 Kyoto Protocol, aimed at curbing greenhouse gas emissions. The UN official panel on climate change says emissions must be limited to avoid dangerous global …