The study indicates that altering cruising altitudes by relatively small margins may prevent the formation of contrails, a major but often overlooked driver of atmospheric warming. The findings suggest that avoiding contrail-forming conditions could cut aviation’s total climate impact by nearly half, offering a near-term mitigation option that does not rely on new aircraft technology or alternative fuels. Why contrails matter more than they appear Contrails – the thin, white streaks visible behind aircraft at high altitude – form when hot engine exhaust mixes with cold, humid air. Under specific atmospheric conditions, this interaction produces ice crystals that can evolve into long-lived cloud formations. While visually subtle, these clouds play a measurable role in climate dynamics. They trap outgoing heat in the Earth’s atmosphere, amplifying warming beyond the direct effects of carbon dioxide emissions. Although aviation accounts for roughly 2–3% of global CO₂ output, its overall climate footprint is higher when these non-CO₂ effects are included. A low-tech intervention with high impact The research focuses on contrail avoidance, an operational strategy that involves adjusting aircraft …