The Prince of Wales is often accused of being woolly-minded by critics of his green views. and this week he set out to prove them right. Indeed, the other night he was urging a flock of supporters, ranging from the Duke of Montrose to Lily Cole, to become "just a little bit more woolly" themselves.  It was the launch of Wool Week, part of a campaign he started five years ago to boost "a wonderful, versatile and sustainable substance ignored in favour of products made from non-renewable fossil fuels". Though the foundation of the country's wealth for centuries, wool then fetched farmers less than the cost of shearing it.  Things have improved, but while Charles II caused acts of Parliament to be passed to increase consumption by decreeing all bodies should be buried in the stuff, his namesake has to resort to making us feel a bit sheepish. But the Prince does recommend wool coffins (which, he says, are "to die for").  He urged his star-studded audience to "insulate your houses with it". It does the job well, lasts the lifetime of the building, and captures carbon while growing. But it's more expensive in the short term, so official energysaving drives neglect it; fewer than 200 of the 1.7 million lofts insulated under the main scheme have it.  Perhaps ministers should stop following the flock and consider helping the greener material that is better longterm value.