Utopias in conflict: In the March 1978 issue of Energy Policy Alvin Weinberg reviewed Soft Energy Paths: Toward a Durable Peace by Amory B. Lovins (231 + xx pp, hardback $15.40, £10.30, US paperback $6.95, Ballinger Publishing Co, Cambridge, Mass, 1977, distributed in the UK by John Wiley and Sons Ltd, Chichester; £0.95, Penguin Books Ltd, Harmondsworth, Middlesex, 1977). Amory Lovins responds below