... of biogas. Anaerobic digestion (AD) with biogas production, including utilisation of the organic fraction of waste materials and of residues, is a particularly promising choice and experiences ... appropriate waste management schemes in urban areas and in agriculture. Biogas production has high potential worldwide, and it is in particular digestion of solid materials which is of increasing ... 1 1960 88,1 million 5,6 million 6,4 2 1970 121.1 million 8 million 6,6 3 1980 151,6 million 14,5 million 9,6 4 1990 205 million 33 ,2 million 16,2 5 2005 251 million 82 million 32 ,6 Source...