Reuters: John Ibbett and pigs go back a long way. "The pig manager pushed me round in a pram," recalls Ibbett, whose family have been farming on the same site since 1939. Now he’s proud his family farm can turn muck into electricity, using new technology paid for by a multi-million pound windfall. His Bedfordia Group is one of only a handful of companies with farm-based biogas plants in Britain. Scientists complain that the world has so far failed to support agriculture in the fight …