The Climate Change Committee says Heathrow’s third runway could go ahead only if the aviation industry pays for cleaner fuels and for carbon dioxide removal technologies, framing these costs as essential to decarbonisation.

Even with expansion, the CCC warns Heathrow would become the single largest source of CO2 by 2050 and would not be compatible with the UK’s Net Zero target without industry-funded climate actions.

The CCC argues the expansion should be conditioned on airlines paying for carbon removal and efficiency improvements, linking costs to decarbonising aviation.

There are concerns about equity, as higher-income groups fly more; policymakers debate whether to implement a frequent-flyer levy to address inequalities.

Key political figures express mixed views: the Chancellor endorses the economic case for expansion, while the Prime Minister and Mayor express climate and regional concerns; local opposition includes plans to demolish about 750 homes for the runway.

The government cautions expansion must align with net-zero targets, notes ongoing SAF production and cleaner technologies, and highlights potential long-term economic benefits and jobs.

The Department for Transport conducts a four-test consultation (economy, climate, air quality, noise); a final Commons vote on the planning framework is expected later this year.

Estimated cost impacts suggest higher airfares, with a return trip to Alicante rising by around 150 pounds and a trip to New York by about 400 pounds in today’s prices by 2050.

Campaigners argue against relying on nascent technologies like SAF and carbon removal, warning they may be unproven or too slow to scale and call for halting expansion.

Heathrow contends expansion and climate goals are compatible, projecting about 40 billion pounds to the economy and up to 60,000 local jobs, while increasing capacity to 150 million passengers annually.

Industry and government responses: Heathrow says expansion can be compatible with net-zero and may use carbon tax revenues to support green measures; Airlines UK warns the CCC’s approach could make holidays unaffordable and advocates affordable SAF and direct routes.

The CCC notes aviation accounts for roughly 9% of UK emissions and has surged since 1990 due to higher passenger numbers.