Guardian: China’s carbon emissions will peak between 2030 and 2040, the country’s science and technology minister told the Guardian as the global climate change summit began in Copenhagen. In an exclusive interview, Wan Gang said he hoped the maximum output of Chinese greenhouse gases would come as soon as possible within that range, and spelled out the steps that needed to be taken to achieve this. His comment, while not official policy, is the closest the world’s biggest emitter has come to …