Nature has published a peer-reviewed review titled "Feedstocks and processes for global-scale sustainable aviation fuel production," addressing two of the central technical questions hanging over the SAF sector: which feedstocks can scale beyond today's narrow base of used cooking oil and tallow, and which conversion processes are ready to convert those feedstocks at aviation volumes.

The article, released in Nature, lands as airlines prepare 2030 SAF submissions under ReFuelEU and as ICAO member states prepare for the CORSIA 2025 triennial review. Its scope, signalled by the title, covers the full feedstock spectrum the industry is debating — bio-based waste oils, agricultural and forestry residues, municipal solid waste, alcohols such as ethanol, and the hydrogen and captured CO₂ inputs that underpin e-SAF. On the process side, the review covers HEFA, Fischer-Tropsch, alcohol-to-jet and power-to-liquid — the four pathways approved or in active qualification under ASTM D7566.

Why does a Nature review matter for aviation buyers?

Whether a peer-reviewed venue like Nature takes on the SAF production question matters beyond academia. Airline procurement teams, lessor-backed SAF offtake funds, and national policymakers regularly cite academic literature when calibrating offtake prices, setting subsidy rates, and drafting blend mandates. A consolidated review in a generalist journal reaches corporate sustainability officers and capital-markets investors who do not typically read fuel chemistry journals.

The paper also arrives at a moment when SAF producers are differentiating on feedstock flexibility. Neste, the largest HEFA SAF producer, has flagged feedstock scarcity as the binding constraint on its Solapur and Rotterdam expansions. Newer entrants — including HIF Global, 1PointFive, and Chinese e-SAF developers — are positioning electrolyser access and CO₂ supply rather than biofuel feedstock as their primary scaling challenge. A review that ranks feedstocks and processes against scale-up criteria gives corporate buyers a shared reference.

What does the paper's scope tell us about its conclusions?

The title indicates coverage of both raw materials and conversion routes — a pairing that reflects how the SAF industry has organised its own internal roadmaps. IATA, ICAO, and the World Economic Forum's Clean Skies for Tomorrow coalition have all stressed that neither feedstock availability nor process readiness can be assessed in isolation, since some approved pathways (HEFA, for example) are feedstock-constrained while others (FT, ATJ, PtL) are constrained by capital cost and project finance.

The review does not announce new ASTM certifications, offtake agreements, or refinery openings. Its value to operators and investors lies in consolidating evidence: which feedstocks have demonstrated supply at the million-tonne-per-year level, and which remain confined to pilot or demonstration plants. Whether it proposes a quantitative cost comparison or instead catalogues technical readiness levels will determine how directly airlines and refiners apply its findings to procurement decisions.

Where does this leave the commercial picture?

SAF currently trades at two to five times the price of conventional Jet A-1, depending on pathway and offtake length. A substantial portion of that premium reflects feedstock cost rather than conversion capex. Independent, peer-reviewed rankings of feedstock and process readiness give airline treasury and fuel-purchasing teams an external benchmark against which to challenge supplier pricing.

As procurement teams finalise 2026 SAF offtake contracts and as governments calibrate subsidy and mandate frameworks, peer-reviewed assessments of feedstock and process readiness are likely to carry more weight in policy and procurement decisions than supplier presentations alone.