The U.K. government has lowered its expectations for clean aviation technology in updated 2050 forecasts. It now assumes sustainable aviation fuels will supply 30% of fuel by 2050 instead of the 50% in the 2022 jet-zero strategy, and it cut expected annual fuel efficiency gains from 2% to 1.3%. Aviation emissions under the technology development scenario would still reach about 28 million tonnes in 2050, roughly 50% higher than previously planned. The update matters as Heathrow's third runway heads toward a final decision expected by 2029. A third runway would add an estimated 3.5 million tonnes of carbon dioxide equivalent per year in 2050, making it harder for the U.K. to stay within legally binding carbon budgets. Officials also say passenger numbers could rise at least 50% by 2050. The article explains why cleaner fuels and electric aircraft are not scaling fast enough to offset demand growth, and it links to policy options like France's higher taxes on short-haul flights. For anyone tracking aviation emissions, carbon budgets, or airport expansion, this is a clear look at the gap between climate promises and delivery.
