[en] The traditional renewable energy resources such as firewood, charcoal, crop residues (wastes) and animal dung, account for virtually all of the fuel used in many rural areas, and may account for about 20 to 25 per cent of the total energy consumption in the developing world. But this sources of energy posses a clear danger in the living of much of the population of the rural areas and increases the air pollution. About 75 of the population of the rural areas in the developing countries uses traditional fuels, largely within household and primary for cooking. 15 figs