Zero-waste advocates say a government-funded report into the merits of biogas lacks balance, is shortsighted, and risks crowding out more effective renewable energy projects. The study shows organic waste from kitchens and farms can broken down into biogas and turned into biomethane. Photo: 123RF / Rafael Ben-Ari/Chameleons Eye Last week, a government-backed study found that 4 percent of the country's energy-related emissions could be avoided by switching to low-emitting, renewable alternatives. It said this could be done through anaerobic digestion (AD), whereby organic waste from the kitchens and the farm is broken down into biogas which is then cleaned and upgraded into biomethane.