The policy on which they are all agreed, set out in the Coalition’s “2050 Pathways for tackling climate change”, centres on three main steps, each more bizarre than the last. Step one is that we should “decarbonise” our economy, not just by closing down the coal and gas-fired power stations that supply more than 70 per cent of our electricity, but by chucking out all those gas appliances 90 per cent of us use for cooking and heating.