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[[Sustainable biofuel]]s are an alternative to [[electrofuels]].<ref>{{Cite web|author=Mark Pilling|title=How sustainable fuel will help power aviation's green revolution|url=https://www.flightglobal.com/flight-international/how-sustainable-fuel-will-help-power-aviations-green-revolution/143044.article|date=2021-03-25|website=Flight Global}}</ref> Sustainable aviation fuel is certified as being [[sustainable]] by a third-party organisation.<section end="summary" />
{{TOCLimit}}SAF technology faces significant challenges due to feedstock constraints. The oils and fats known as hydrotreated esters and fatty acids (Hefa), crucial for SAF production, are in limited supply as demand increases. Although advanced [[Electrofuel|e-fuels]] technology, which combines waste {{Chem2|CO2}} with [[Green hydrogen|clean hydrogen]], presents a promising solution, it is still under development and comes with high costs. To overcome these issues, SAF developers are exploring more readily available feedstocks such as [[Lignocellulosic biomass|woody biomass]] and agricultural and municipal waste, aiming to produce lower-carbon jet fuel more sustainably and efficiently.<ref>{{Cite web |date=2024-05-10 |title=New Technology Helps Advance Non-Hefa SAF Projects |url=https://www.energyintel.com/0000018f-5ac5-d00d-a7df-7ff56da40000 |access-date=2024-05-14 |website=Energy Intelligence |language=en}}</ref><ref>{{Cite web |date=2024-08-14 |title=New SAF Process Could Transform Industry |url=https://www.ainonline.com/aviation-news/aerospace/2024-08-14/new-saf-process-could-transform-industry |access-date=2024-08-14 |website=Aviation Industry News |language=en}}</ref>
==Environmental impact==
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