NOVELTY - An engineered fuel feed stock comprises at least one component derived from a processed municipal solid waste (MSW) stream. The feed stock has a carbon content of 30-80%; hydrogen content of 3-10%; sulfur content of less than 2%; and an ash content of less than or equal to 10%. The feed stock contains no glass, metals, grit, and non-combustibles.    USE - As engineered fuel feed stock for producing synthesis gas (claimed) useful for producing liquid fuels by Fischer-Tropsch technology; as a fossil fuel substitute for combustion; and for producing thermal energy, power, biofuels, petroleum and chemicals.    ADVANTAGE - The feed stock contains no glass, metals, grit, and non-combustibles. The engineered fuel feed stock when combusted produces less greenhouse gas (GHG) emissions as compared to known level of GHG emissions of biomasses when combusted. Also, the fuel feed stock when combusted produces less sulfur emission, hydrogen chloride emission, and less heavy metal emissions such as mercury emission as compared to the combustion of coal. The engineered fuel feed stock avoids the emission of particulate matters, nitrogen oxides, carbon monoxide, carbon dioxide, volatile organic compounds, and halogen gases; and has reduced emission profiles with respect to GHG as compared to the GHG emitted from combusted coal and biomasses such as wood, and switch grass. The engineered fuel feed stock provides an efficient way to moderate the operating conditions of thermal conversion devices by lowering the operating temperature, by reducing the need for oxygen supply or steam supply, and by allowing for the relaxing of emission controls. Moreover, the feed stock provides a powerful means for upgrading low-grade fuels such as sludge, yard-wastes, food wastes and the like to be transformed into a high quality fuel. The engineered fuel feed stock is biologically, chemically and toxicologically inert, i.e. it does not exceed the limits for acceptable limits on biological, chemical and toxicological agents contained within the engineered fuel feed stock. The feed stock does not release toxic products after production or upon prolonged storage. The engineered fuel feed stock does not contain pathogens or live organisms, nor contain the conditions that promote the growth of organisms after production or upon prolonged storage. The engineered fuel feed stock has sufficient moisture content and thus it does not promote growth of organisms, and is anti-absorbent, i.e. it does not absorb water to any appreciable amount after production and upon prolonged storage. The engineered fuel feed stock is also air stable, i.e. it does not decompose in the presence of air to give off appreciable amounts of volatile organic compounds.