PLASTIC PAILS AND TANKS MOUNTED WITH SMALL PLASTIC PIPES THEN SEALED WITH SEALANT TO ARE BUILT. THEN NAMED BIO DIGESTERS WHICH WHEN COW DUNG MIXED WITH WATER AND SOME FOOD LEFTOVERS, FARM PRODUCES, ASSORTED FOOD STUFFS ARE PUT INSIDE IT FOR A WEEK IS THEN ABLE TO TRAP METHANE GAS PRODUCED BY THE MIXTURE WHICH IS USED AS A COOKING GAS. THEN THE LIQUID SUBSTANCE LEFT IN THE BERRELS CAN BE USED AS FERTILISER FOR...