BBC: Following the near collapse of the UN climate negotiations in December and the seeming paralysis of the Convention on International Trade in Endangered Species (CITES) in March, the whole idea of solving the world’s environmental problems through multilateral negotiations seems to be in crisis. But, argue Maurice Strong and Felix Dodds, another recent development holds out the promise of reversing the trend. In two years’ time, Rio de Janeiro will host another Earth Summit – 20 years …