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While the fossil-fuel era is entering its sunset years, a new energy regime is being born that has the potential to remake civilization along radical new lines. Hydrogen is the most basic and ubiquitous element in the universe. It is the stuff of stars and, when properly harnessed and made from renewable sources, it is the “forever fuel,” notes author and alternative energy proponent Peter Hoffman. It produces no harmful CO2 emissions when burned; the only byproducts are heat and pure water. We are at the dawn of a new economy, using hydrogen as the energy carrier, which will fundamentally change the nature of our financial markets, political and social institutions, just as coal and steam power did at the beginning of the Industrial Age.

As Hoffman writes in his book, Tomorrow’s Energy: Hydrogen, Fuel Cells and the Prospects for a Cleaner Planet (MIT Press), hydrogen can “propel airplanes, cars, trains and ships, run plants, and heat homes, offices, hospitals and schools….As a gas, hydrogen can transport energy over long distances, in pipelines, as cheaply as electricity (under some circumstances, perhaps even more efficiently), driving fuel cells or other power-generating machinery at the consumer end to make electricity and water. As a chemical fuel, hydrogen can be used in a much wider range of energy applications than electricity.”

Chemically bound hydrogen is found everywhere on Earth: in water, fossil fuels and all living things. Yet, it rarely exists free floating in nature. Instead, it has to be extracted from water or from hydrocarbons. Today, nearly half the hydrogen produced in the world is derived from natural gas via a steam reforming process. The natural gas reacts with steam in a catalytic converter. The process strips away the hydrogen atoms, leaving carbon dioxide as the byproduct (and, unfortunately, releasing it to the atmosphere as a global warming gas). Coal can also be reformed through gasification to produce hydrogen, but this is more expensive than using natural gas and also releases CO2, which scientists hope to keep earthbound through a process called “carbon sequestration.” Hydrogen can also be processed from gasoline or methanol, though again CO2 is an unwanted byproduct.

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A hydrogen economy is a hypothetical economy in which the energy needed for motive power (for automobiles and other vehicle types) or electricity (for stationary applications) is derived from reacting hydrogen (H2) with oxygen. While the primary purpose is to eliminate the use of carbon-based fossil fuels and thus reduce carbon dioxide emissions, a secondary goal is to provide an energy carrier to replace dwindling supplies of petroleum.

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 isotopes 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 affects them all

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