Guardian: In principle it's a brilliant solution. Instead of leaving food waste and sewage and animal manure to decay in the open air, releasing methane which contributes to global warming, you can contain it, use micro-organisms to digest it, and capture the gas.
Biogas from anaerobic digestion could solve several problems at once. As well as a couple of million tonnes of sewage sludge, the UK produces between 16-18m tonnes of food waste, much of which still goes into landfill. Farms in this country generate...