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fuel cells, because, fuel cells provide a stable energy source, reduce emission of co2, thereby reducing global warming, high efficiency-more efficient then combustion systems (cars) also do not burn fuel, computers, cellphones, to, international economy, provide renewable engery in cars, trucks, etc., energy by elctrcity & heat as long as the supply of fuel and oxygen is supplied, physical security-fuel cells are portable, which allow people to move away from long distance power source, like batteries, but do not have to be recharged, fuel cell, in, 1839, transportation-buses, cars, airplanes, nasa programs and missions, emmit zero pollution, by, sir william grove, welsh scientist, stationary-nursing homes, office buildings, portable electronic devices, high quality power-very efficient, important to economy, phosphoric acid (pafc), used commerically to produce electricity in hospitals, hotels, and schools, high reliability-fuel cells can be set up to get power to a grid-connected power user, 3 times more efficient then internal combustion engines, because, countries are looking for other energy sources then what they have now, no pollution emmissions, byproducts are water and heat, residential, many types, emergency power and recreational uses, security of supply-energy is supplied by hydrogen natural gas, ethanol, propane, military uses, alkaline, used by nasa on their space mission which provided them with eletricity and drinking water, to, the united states economy, energy efficiencies are 40-50% while interal combustion is 10-16%