The UK chancellor, Rachel Reeves, has described so-called sustainable aviation fuel (SAF) as a “game changer”. As she announced government support for a series of airport expansions, she said that the fuel “can reduce carbon emissions from flying by 70%”.
This number is misleading. Optimistic estimates do suggest that fully replacing fossil jet fuel with its sustainable alternative could lead to total savings of around 70%. But it will be hard to produce enough SAF to make a difference on that sort of scale. Even if the UK meets its ambitious targets, an annual saving of 7% by 2030 is more plausible.
