Oil, out-of-date milk and even roast dinner residues contribute to the growth of fatbergs, a sticky problem for sewerage systemsChange by degrees offers life hacks and sustainable living tips each Saturday to help reduce your household’s carbon footprintGot a question or tip for reducing household emissions? Email us at changebydegrees@theguardian.comFatbergs are a sticky problem for sewerage systems – blocking pipes, spawning poo balls, and even forcing the cancellation of a Bryan Adams concert.When households pour cooking oils, out-of-date milk or the residues of a roast dinner down the sink, it contributes to the buildup of fats, oils and grease – known as FOG – in the wastewater system, and the growth of fatbergs. Continue reading...