The Climate Change Committee (CCC), the UK government's advisory body on climate, stated that the proposed third runway at Heathrow Airport is currently incompatible with national net-zero targets. The committee recommended that the project should only proceed if the aviation industry is legally required to fund cleaner fuels and carbon-removal technologies. Nigel Topping, chair of the CCC, stated that the industry must take responsibility for its emissions and bear the costs of decarbonization.
The Heathrow expansion is a £33 billion project intended to increase the airport's capacity from 85 million to 150 million passengers annually. According to the Department for Transport (DfT), the project could contribute approximately £40 billion to the economy and support up to 60,000 local jobs. However, the CCC report noted that, if completed under current policies, the expanded airport would produce more carbon dioxide than any other single economic sector by 2050.
Airlines UK, representing the aviation industry, rejected the CCC's proposal to have carriers shoulder the full cost of scaling up carbon-removal technology. Chief executive Tim Alderslade stated that while airlines support net-zero goals, the transition must remain affordable to prevent flying from becoming a "preserve of the rich." Conversely, Dr. Lois Pennington of the Tyndall Centre for Climate Change Research told the BBC that because carbon-removal technologies are not yet at scale, the only reliable way to meet climate targets is to limit or reduce the total amount of flying.
The recommendation also places a potential financial and operational burden on the aviation industry and its employees. If the government adopts the CCC's advice, airlines would be required to fund carbon-removal machines—technology that currently lacks credible plans for 99% of the scale needed by the late 2030s. This shift would set a precedent for "polluter pays" legislation, potentially moving the cost of environmental mitigation from the public treasury directly to private sector infrastructure projects and their customers.
Beyond the financial impact, the project faces local opposition due to the planned demolition of 750 homes and concerns regarding noise and air pollution for residents under the flight path. While Chancellor John Healey stated the government intends to proceed because the "economic case stacks up," a final decision rests on a House of Commons vote expected later this year. This vote will determine the planning framework for the expansion, balancing the projected £40 billion economic boost against the environmental requirements and the concerns of local councils and officials, including Mayor of London Sadiq Khan and Prime Minister Andy Burnham.