How much carbon developed and developing nations will be allowed to emit in the coming years is a hotly contended issue. Pan Jiahua and Chen Ying discuss one possible solution.

• 未来几年中，发达国家与发展中国家到底可以排放多少温室气体，这是一个被热烈讨论的话题。潘家华、陈迎等提出了一个可行方案。