Opinion letters

摘要

From Gerry Wolff, Desertec-UK It is true that decarbonising the world's economies will require some tough choices, but perhaps not quite as tough as Fred Pearce suggests in his article on the implications of a Severn barrage (18 April, p 32).rnA report published by Friends of the Earth Cymru in 2007 quotes evidence that tidal lagoons in the Severn estuary could produce more electricity than the proposed barrage, and with less harm to wildlife.