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To reduce air pollution during rocket launches much research has been done to develop space propellants that are environmental friendly ("green") and contribute towards non-toxic propellants. These propellants are generally easier and safer to handle than the conventional ones, and boater hat are expected to bring down the costs associated with propellant transport and storage, and in spacecraft development and on-ground operations. In Europe, all of these factors have made non-toxic propellants more desirable.
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