Various ways of hydrogen production were described. At the beginning hydrogen will probably be produced from fossil fuels by means of steam reforming, autothermal reforming or partial oxidation. As current laboratory investigations show, hydrogen can also be obtained from biomass, methanol or ethanol using the three processes. Biological processes of hydrogen generation from various organic materials or from water are subjects of separate research. Another option is water decomposition using solar energy and synthetic catalysts. From the point of view of atmosphere protection, some ways of hydrogen production has to be negatively evaluated. For example, hydrogen production from any fossil fuel results in the same amount of CO2 emission as in the case of direct combustion of the fossil fuel. Another reason of negative evaluation is that combustion of large amounts of hydrogen produces high emission into atmosphere of water vapor, which is greenhouse gas. So far, the atmospheric concentration of water vapor depends on the intensity of ocean water vaporization. The emission of water vapor from hydrogen combustion will definitely change the status quo ante. From the point of view of both emissions (CO2 and H2O) a safe solution is the production of hydrogen from biomass.