Question to the Department for Transport:

To ask the Secretary of State for Transport, what estimate she has made of how much fuel lifecycle Greenhouse Gas emissions will be reduced within the next four years.

The Department for Transport does not hold overall forecasts for lifecycle greenhouse gas (GHG) emissions of fuels. Projections for the lifecycle emissions impact of individual low carbon fuels policies are primarily set out in their associated cost-benefit analyses such as that published in 2024 before the Sustainable Aviation Fuel Mandate was introduced or published in March 2025 for the Maritime Decarbonisation Strategy.

The Carbon Budget and Growth Delivery Plan, published 29 October, included detail on policies in place to reduce greenhouse gas emissions from fuels used in surface transport and aviation, and estimates of the emission reductions they would achieve. These projections are on the basis of the carbon accounting protocol used to produce the Greenhouse Gas Inventory, rather than lifecycle GHG emissions savings. For surface transport, this analysis estimated an 18.0 MtCO2e reduction in emissions between 2025 and 2030 (17% reduction). For aviation, this analysis estimated a 3.3 MtCO2e reduction in emissions between 2025 and 2030 (9% reduction).