NASA has been working on two “alternatives” to petroleum-based fuel–but both of these are still based on fossil fuels. The Fischer-Tropsch process uses either coal or natural gas -derived synthetic petroleum fuel.
In 2010, the U.S. Air Force created the first all-engine flight of an aircraft using a blend of biomass and conventional jet fuel. The biomass-derived fuel was called hydrotreated renewable jet, or HRJ, and is created from oil or animal fat feedstocks. After a demonstration of the fuel in use, more refineries made plans to switch some production to HRJ, including Tyson Foods and AltAir Fuels.
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