Since the start of this decade, researchers have found various signs that the climate is more influenced than they had thought by the sun's complexion-moving, like the numbers of sunspots, in an 11 year cycle. The implication is unmissable, and tempting. Could global warming be blamed not just on a reckless orgy of fossil fuel burning that pumps greenhouse gases into the atmosphere, but on the sun's natural and unstoppable hotting up?.