Rolls Royce has begun ground testing 100% sustainable aircraft fuel (SAF) in small commercial aircraft. The SAFs are made using a range of sustainable sources, including solid urban waste, cellulose waste from forestry, used cooking oil, energy plants such as commelina, jatropha, halophytes and algae, as well as non-biological fuels such as exhaust gases from steelworks. According to Rolls-Royce, the new fuel has the potential to reduce carbon dioxide emissions by over 75% in a life cycle.

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