A growing band of experts are arguing that personal carbon virtue and collective environmentalism are futile as long as our economic system is built on the assumption of growth. The science tells us that if we are serious about saving Earth, we must reshape our economy. This, of course, is economic heresy. Growth to most economists is as essential as the air we breathe. In recent weeks it has become clear just how terrified governments are of anything that threatens growth. Amid the confusion, any challenge to the growth dogma needs to be looked at very carefully.