The UK government has significantly downgraded its expectations for reducing aviation emissions by 2050, according to updated forecasts released in June. The new projections indicate that even with ambitious technological rollouts and efficiency improvements, aviation emissions will reach approximately 28.1 million tonnes of carbon dioxide equivalent in 2050, compared to the 19.3 million tonnes targeted under the previous government’s 2022 ‘jet-zero’ strategy.
The revised forecasts reflect reduced assumptions across several key areas. The government now expects sustainable aviation fuels to comprise 30% of aviation fuel by 2050, down from an earlier target of 50%. Additionally, the lifecycle carbon savings from these fuels are expected to be lower than previously calculated. Fuel-efficiency improvements for aircraft have been revised downward to 1.3% annually from the earlier projection of 2% per year, based on analysis conducted by the Aviation Impact Accelerator. Battery-powered aircraft are also expected to play a more limited role, with only smaller zero-emissions planes anticipated to be operational by 2035.
The updated analysis accounts for planned airport expansions, including at Heathrow, where passenger numbers are projected to increase by at least 50% by 2050. The government’s Labour administration has signaled support for a third runway at Heathrow, with a final planning decision anticipated by 2029. The new emissions forecasts present a challenge to the government’s stated justification for this expansion, which has been based partly on the viability of new clean-aviation technologies.
Meeting the UK’s net-zero target of 2050 with these higher aviation emissions would require either large-scale deployment of carbon dioxide removal technologies, which remain largely unproven and costly, or the planting of extensive new forests. Critics and environmental analysts have noted that the forecasts demonstrate aviation emissions will exceed the sector’s share of the UK carbon budget even before considering expansion projects, raising questions about the compatibility of airport growth with legally binding climate commitments.
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