RE:RE:Biofuels - the competition The whole idea of biofuels being carbon neutral is stopping methane from natural waste processes such as animal manure and landfills from escaping into the environment. Methane is one of the worst greenhouse gases. These waste gases are collected and purified and is now called renewable natural gas. When this is burned carbon dioxide is released. Since CO2 is not as bad a greenhouse gas as methane thus the reduction in harmful environmental gas. The production of RNG is increasing rapidly. You can get more information by looking at Xebec which is another Quebec based company if you are interested.