Biogas could be used to slash global greenhouse gas emissions by up to 13%. That’s the verdict from the World Biogas Association (WBA), which claims the fuel has a great potential to address a wide range of environmental and economic challenges around the world. It suggests biogas, which is a mixture of gases produced by the breakdown of organic matter in the absence of oxygen, could be used to help cut global greenhouse gas emissions from 3,290 million tonnes of carbon dioxide equivalents to 4,360 million tonnes of carbon dioxide equivalents. This would be achieved by substituting coal, oil and gas in international energy mixes, as well as avoiding emissions through the better management of organic wastes and reducing the need for fossil fertiliser manufacture, crop burning and deforestation. The report highlights that currently, only 2% of available feedstocks undergo anaerobic digestion and are turned into biogas – these wastes include food, sewage, agricultural slurry and leftover crops.