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Africa agencies agricultural America amount Asia Assam basic biogas Burundi cent centres century climate colonies commercial energy commodities contributed cost crop decrease digesters domestic donor drying Dublin dung economic employment established ethanol Europe European exports factor farmers farming fertiliser food production fuel global South grain harvesting hectares Hololo Valley human important income increase India industry infant formula Ireland Irish irrigation Klong Toey labour land Lesotho litres live Lome ment million monsoon monsoon regions North South Report organised peat plant poor countries population poverty problems rain rice rich countries rivers rural areas Rwanda schemes Second World sectors shanty town slum social soil erosion solar source of energy South Africa Sri Lanka STABEX supply Third World Third World countries tion trade United Nations urban areas vegetation villages water available wind women workers Zaire