LILLE, France (Reuters) - "These are the three giant stomachs of Lille."
Amid the hum of machinery and warm odour of putrefying autumn leaves, official Pierre Hirtzberger is explaining how three giant fermenters can convert household food waste, trimmings from parks and gardens and the slops from school and hospital canteens into enough methane gas to power about a third of the buses in the French city.
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