Reuters: A global carbon emissions pricing system pushed by top energy companies is unlikely to be a big part of any United Nations' deal to curb global warming, some experts say, because many countries have little faith in such cross-border initiatives. "All countries are relatively sceptical on international market mechanisms," said Niklas Hoehne, founding partner of research group NewClimate Institute. "They are open to have national trading mechanisms or national pricing, but to have these mechanisms...