Future hydrogen supply, questions

Primary energy supply is a key issue for any new transportation fuel. Constraints on domestic resources and production of petroleum have led to increasing levels of imports. An important policy driver for alternative fuels for transportation in the USA is that they will alleviate some of the issues surrounding dependence and economic vulnerability related to petroleum imports, especially from politically unstable parts of the world. This raises some important questions for hydrogen as a future alternative fuel will the USA have the resources to produce hydrogen for vehicles at low cost and with low environmental impact ... 

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