Now Piers has a very good record of forecasting the weather. He has been bang on about these cold winters. Like JMW Turner and the Aztecs he thinks we should be paying more attention to the Sun. According to Piers, global temperature depends not on concentrations of CO2 but on the mood of our celestial orb. Sometime too bright the eye of heaven shines, said Shakespeare, and often is his gold complexion dimmed. That is more or less right. There are times in astronomical history when the Sun has been churning out more stuff — protons and electrons and what have you — than at other times. When the Sun has plenty of sunspots, he bathes the Earth in abundant rays.