Not exactly safe
We mistakenly described nitrous oxide, one of the byproducts of an engine powered by liquid hydrogen, as being environmentally safe (The hypersonic plane designed to reach Australia in under five hours, page 9, February 5). It is a greenhouse gas nearly 300 times more powerful than carbon dioxide. However, the developer, Reaction Engines, has a research project under way to devise ways of eliminating or capturing all of the NOX elements produced by the fuel. Link
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