Your feature on the potential of biogas referred to the 'double win' of using less fossil fuels and promoting eco-friendly waste disposal ('How food waste can power your stores', The Grocer, 2 February, p30). But there is a third win retailers and manufacturers have overlooked, which is communicating their environmental credentials well to customers. We have looked at how anaerobic digestion (AD) technology can reduce the carbon footprint of food supply chains and be profitable, and found that electricity from biogas derived from vegetable waste offers greenhouse gas emissions savings of up to 90% compared with using mains electricity. Although AD creates practical challenges, diverting waste from landfill has economic and environmental implications for producers and retailers. All too often, shoppers feel detached from the environmental measures taken by big business. Many find them conflicting and hard to understand. With the debate over whether biofuels are a positive or a negative, it is no surprise that consumer confusion reigns. AD and biogas could change that. Although not a term in everyday use, biogas is a concept consumers find relatively easy to grasp. They liken it to home composting and making something out of nothing. Biogas makes sense in the minds of shoppers and gives the plethora of CSR and environmental initiatives more integrity. The environmental goals of biogas are gaining more attention, but who will be the first to net the biogas hat-trick?