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ViewpointSustainable Hydrogen ProductionIdentifying and building a sustainable energy system are perhaps two of the most critical issues that today's society must address. Replacing our current energy carrier mix with a sustainable fuel is one of the key pieces in that system. Hydrogen as an energy carrier, primarily derived from water, can address issues of sustainability, environmental emissions, and energy security. Issues relating to hydrogen production pathways are addressed here. Future energy systems require money and energy to build. Given that the United States has a finite supply of both, hard decisions must be made about the path forward, and this path must be followed with a sustained and focused effort. National Renewable Energy Laboratory, Golden, CO 80401–3393, USA. E-mail: jturner{at}nrel.gov
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Science. ISSN 0036-8075 (print), 1095-9203 (online)
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