Britain’s Climate Change Committee (CCC), the government’s climate advisory body, said Heathrow Airport cannot expand under current policies while the country meets its net-zero emissions target by 2050. The Labour government backed a third runway last year to support economic growth. The CCC said aviation must address all emissions by 2050 through greater use of sustainable aviation fuel (lower-carbon jet fuel) or engineered carbon-removal credits. SAF currently represents less than 1% of global aviation fuel use and costs several times more than conventional jet fuel, while fewer than 2 million metric tons of engineered removals have been generated globally. The committee called for a 25-year net-zero aviation strategy, phased decarbonization costs for airlines and contingency plans if key technologies fail to scale.