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[–]Intuit 2 insightful - 2 fun2 insightful - 1 fun3 insightful - 2 fun -  (1 child)

The hydrogen "economy".

Hydrogen is a powerful fuel, and a frequent component in rocket fuel, but numerous technical challenges prevent the creation of a large-scale hydrogen economy. These include the difficulty of developing long-term storage, pipelines and engine equipment; a relative lack of off-the-shelf engine technology that can currently run safely on hydrogen; safety concerns due to the high reactivity of hydrogen fuel with environmental oxygen in the air; the expense of producing it by electrolysis; and a lack of efficient photochemical water splitting technology.

[–]Chop_Chop[S] 2 insightful - 2 fun2 insightful - 1 fun3 insightful - 2 fun -  (0 children)

Not stopping China, and they will control the industry soon. https://www.cleantech.com/hydrogen-in-china/