Guardian: Last Friday's report from the United Nations confirms the huge danger from our continued dependence on fossil fuel. But one simple thing can break this dependence. It needs to be cheaper to produce non-carbon energy than it is by digging up coal, gas or oil. Once this happens, most of the coal, gas and oil will automatically be left undisturbed in the ground.
To make non-carbon energy become competitive is a major scientific challenge, not unlike the challenge of developing the atom bomb or sending...