Guardian: What is China playing at on climate change? That may be the most important question in the world right now, thanks alone to its status as the world’s biggest producer of greenhouse gasses. But what Beijing is – or is not – prepared to do will also determine whether the rest of the world can reach a deal on combating global warming that is worth the paper it’s written on. So it’s hardly surprising that reading the Chinese approach has become the latterday equivalent of cold war …