Guardian: That muffled crunching noise is the sound of me eating my hat. A couple of years ago I wrote to Zac Goldsmith to complain that the Conservative party’s policy on renewable energy was a bad joke. It concentrated on the least efficient and most expensive ways of cutting carbon pollution – rooftop wind turbines and solar panels and domestic combined heat and power – while neglecting much better options. The proposals were uncosted and unquantified. No comparisons were made with other …