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A hydrogen economy is a hypothetical economy in which energy is stored and transported as hydrogen (H2). Various hydrogen economy scenarios can be envisaged using hydrogen in a number of ways. A common feature of these scenarios is using hydrogen as an energy carrier for mobile applications (vehicles, aircraft).
In the context of a hydrogen economy, hydrogen is an energy storage medium, not a primary energy source (see nuclear fusion for an entirely separate discussion of using hydrogen as an atomic energy source). Nevertheless, controversy over the usefulness of a hydrogen economy have been confused by issues of energy sourcing, including fossil fuel use, global warming, and sustainable energy generation. These are all separate issues, although the hydrogen economy impacts them all (see below).
Proponents of a hydrogen economy suggest that hydrogen is an environmentally cleaner source of energy to end-users, particularly in transportation applications, without release of pollutants (such as greenhouse gasses) at the point of end use; and that these advantages may hold similarly with use of hydrogen produced with energy from fossil fuels, if carbon capture or carbon sequestration methods are utilized at the site of energy or hydrogen production.
Critics of a hydrogen economy argue that for many planned applications of hydrogen, direct use of energy in the form of electricity, chemical batteries and fuel cells, and production of liquid synthetic fuels from CO2 (see methanol economy), might accomplish many of the same net goals of a hydrogen economy, while requiring only a small fraction of the investment in new infrastructure.
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