WHAT IS?      Hydrogen is an inodorous, uncoloured and insipid gas formed by diatomic molecules. It is the simplest and most abundant element in the universe, representing 70 percent of its weight, because is present at young stars, interstellar dust and gas clouds suspended in the space. Also constitutes the third compound after oxygen and siliceous. Combined produce water, acids and hydroxides, petroleum and organic matter.   APLICATIONS Terrestrial vehicle engines like cars, trucks, buses, elevators, locomotors, airplanes and ships.   Stationary electric generation in isolated places or urban centres as own generation or co generation, where necessarily can not used electric red due to security reasons, quality service, or both factors. Some important companies are producing right now alternative engines designed specially for hydrogen.       STATUS    As free hydrogen could be found in volcanic emissions because it is present at volcanic gases in 30 percent and also in the rock’s structure. As chemically combined element is situated in water, constituting the 10 % of its weight, organic matter, natural gas, petroleum and carbon. Almost 10 % of human body consist on hydrogen.       ADVANTAGES       Not detonate in the open air.     Not enter in auto combustion or spontaneous combustion.     Not put water in danger.     Not produce cancer.     Not decompose.     Not corrosive.     When it burns with air in internal combustion engines like gas turbines, produces limited undesirable emissions.     Through using of hydrogen in fuel cells (CF), for example in PEM’s ones (proton exchange membrane), could be avoided completely these emissions. At energy generation process through hydrogen and air oxygen, the product of the reaction is only water, exempt of minerals, like distillate water.     It is not toxic unless if contains impurities (CO, As H3, etc).      Chemical industry has been used hydrogen during 100 years and experiences about its security are positive.      The use of hydrogen in CF operations at high temperatures causes 100 times lower emissions than those ones produced by conventional electric centrals.     It is a secondary energy carrier and offers the possibility of introduce a flexible, different and alternative of renewable energies accumulation in fuel markets.     Not radioactive.     Not produce bad smell.