The Climate Change Committee has released guidance indicating that aviation emissions in the UK are projected to reach unsustainable levels by mid-century. According to the committee’s analysis, emissions from the aviation sector could constitute approximately 80% of the nation’s total carbon dioxide output by 2050, representing a significant departure from decarbonization efforts across other economic sectors.
Aviation emissions have more than doubled since 1990, driven primarily by increased passenger demand, while emissions from other industries have declined. The committee has determined that the UK currently lacks adequate policies to reverse this trajectory. Baseline projections suggest that without airport expansion, aviation emissions would reach 38 million tonnes of CO2 by 2050—higher than present levels. A decision on Heathrow’s proposed expansion is anticipated by 2029.
The proposed Heathrow expansion would contribute an additional 2.4 million tonnes of CO2 annually in 2050, equating to roughly 5% of total UK emissions. The committee has concluded that expanding the airport while maintaining current policy frameworks would be incompatible with the nation’s net-zero climate targets. The government previously outlined a “jet-zero strategy” in 2022, but the current administration has acknowledged that projections regarding sustainable aviation fuels, electric aircraft, and efficiency improvements were unrealistic.
The committee recommends that a revised aviation strategy be developed in 2027 before any expansion decision is finalized. The framework should operate on a “polluter pays” principle, requiring the aviation industry to finance emissions reduction measures, including sustainable fuels and carbon removal technologies. The committee estimates that shifting costs to airlines could increase ticket prices by approximately £150 for a return flight to Spain and £400 for transatlantic travel by 2050, though this approach would be preferable to using public funds for carbon removal that would burden non-flying populations.
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