Authors are Secretary, Inter State Council, Ministry of Home Affairs, Govt. of India and Senior Environmental Journalist, Kolkata, respectively. naini_14@yahoo.co.in Methane, which is mostly generated out of solid waste, is one of the major greenhouse gases contributing to global warming. If methane from solid waste is utilised as a source of energy and fuel, it can become an effective alternative resource. Methane contributes approximately 20 per cent to the annual increase in global warming.