I can even imagine wind, tide, wave and biomass energy making small contributions, though these should be a last resort because they are so expensive and environmentally destructive. But this I know: we will need the watts from somewhere. They are our slaves. Thomas Edison deserves the last word: ‘I am ashamed at the number of things around my house and shops that are done by animals – human beings, I mean – and ought to be done by a motor without any sense of fatigue or pain. Hereafter a motor must do all the chores.’
