• # question_answer Pollution from animal excreta and organic waste from kitchen can be most profitably minimized by A)  Storing them in underground storage tanks B)  Using them for producing biogas C)  Vermin culture D)  Using them directly as biofertilisers

[b] Biogas typically refers to a mixture of different gases produced by the breakdown of organic matter in the absence of oxygen. Biogas can be produced from raw materials such as agricultural waste, manure, municipal waste, plant material, sewage, green waste or food waste. It is a renewable energy source and in many cases exerts a very small carbon footprint. Biogas is primarily methane $\left( C{{H}_{4}} \right)$ and carbon dioxide $(C{{O}_{2}})$ and may have small amounts of hydrogen sulphide $\left( {{H}_{2}}S \right),$ moisture and siloxanes.