When is the government going to stop pretending that chopping down trees in North American forests and shipping them across the Atlantic to burn them in UK power stations is a zero-carbon form of energy? The environmental-friendliness of Drax power station in South Yorkshire has been called into question yet again this week after BBC Panaroma investigation reported that some of the woodchips being burned there have allegedly been sourced from established ‘old growth’ forests in Canada rather than recent plantations.