Guardian: It costs £45 in hardback. It has a crashingly dull cover and title. And it has been launched without marketing pizazz. But a new academic book written by David MacKay, a physics professor at the University of Cambridge, is being hailed by some as a “game changer”: a text that could revolutionise popular thinking about our future energy needs and how we could supply them. First published online last summer, Sustainable Energy – Without the Hot Air has gathered fans and accolades from …