Landfills are said to generate 53% of methane emissions in Malaysia with palm-oil mill effluent, swine manure and industrial effluent generating 38%, 6% and 3%, respectively [37]. The total methane emission from waste sectors in Malaysia is given as 1.3 Gg yr−1[16] with the methane emission in 1994 being 2.2 Gg [37].