A recent study from the University of Cambridge has proposed a radical idea to combat emissions in the aviation industry - slowing down planes. The study suggests that reducing flight speeds by around 15% could lead to a 5-7% decrease in fuel burn, thereby aiding in achieving net-zero climate impact by 2050. However, this reduction in speed may come at a cost to passengers, potentially adding 50 minutes to transatlantic flights. The report outlines a five-year roadmap for sustainable aviation, highlighting key recommendations to meet ambitious climate goals. One major recommendation is the removal of contrails formed by aviation, which could reduce climate impact by 40%. Additionally, the report suggests implementing new policies to enhance system-wide efficiency gains, reforming Sustainable Aviation Fuel (SAF) policies, and launching moonshot technology demonstration programs, including long-haul hydrogen aircraft. While these recommendations would necessitate significant industry-wide changes, the report emphasizes the feasibility of achieving sustainable aviation targets by 2050. Eliot Whittington, Executive Director at the Cambridge Institute for Sustainability Leadership, believes that despite the challenges, reaching net-zero flying is possible with strategic planning and collaborative efforts. The innovative use of hydrogen technology in long-haul flights is particularly highlighted as a promising avenue for reducing CO2 emissions and advancing sustainable aviation practices.