China is today the most important emitter of greenhouse gas but that has not been always the situation. The country over passed the United States only recently. As climate change is linked to the accumulated pollution, the new emitters have considered for a long time that the efforts had to be at first imposed to the countries which were responsible of the past accumulation. That was the China position but it has changed. The support, without any ambiguity, by Beijing to the Paris Agreement, is the proof of it and it is not the reflection of diplomatic or symbolic attitude ...