Business Green: The UK’s emerging anaerobic digestion (AD) industry was thrust into the limelight this week after two major new projects that promise to demonstrate the viability of the waste-to-energy technology were unveiled. First up, energy firm Farmgen broke ground on the first in a wave of anaerobic digestion plants, designed to provide farmers with an additional revenue stream from "energy farming". The £2.5m project at Carr Farm in Warton, Preston will be the first AD plant built under …