China's carbon trading scheme: Everything you need to know about the new emission system China is drafting a new climate change law that environmentalists say might address some of the shortcomings in the current carbon trading system. Feb 09, 2021 12:17:14 IST China has launched the world's biggest carbon trading system to help lower carbon emissions, but critics and analysts have raised doubts about whether it will have a signficant impact. China is the world's biggest emitter of the greenhouse gases that drive climate change, and the scheme is part of its efforts to decarbonise its economy by 2060. Here are a series of questions and answers on key parts of the emissions trading scheme (ETS):