In brief
Aviation experts advocate for straightforward adjustments to flight paths, highlighting that minor changes could significantly reduce the warming impact of contrails, ultimately contributing to climate solutions at the upcoming climate conference.
A new study proposes that the climate-warming vapours emitted by jet planes, known as contrails, can be addressed with simple and cost-effective measures. Researchers assert that eliminating these vapours could cost under £4 per flight, providing a feasible solution to a significant environmental issue. The findings will be presented at the UN climate conference, COP29, taking place in Baku, marking the first time this topic has gained attention at such a forum.Contrails form when aircraft fly through cold, humid air, with water vapour released from engines condensing on particles in the exhaust. Though the phenomenon has been known for years, only recently has the impact of contrails on global warming been acknowledged. According to experts, the warming attributed to contrails can be equivalent to the carbon emissions generated by aviation itself.The upcoming COP29 event will explore how minor adjustments in flight operations could effectively mitigate contrail-related warming. Notably, the study by Transport & Environment highlights that approximately 80% of contrail warming stems from just 3% of flights. By optimizing the routes of specific aircraft, researchers estimate that contrail-induced warming could be reduced by more than 50% by 2040.The report also indicates that geography and flight altitude significantly affect contrail formation and their warming potential. For instance, flights over North America, Europe, and the North Atlantic region are responsible for a substantial portion of global contrail warming. Additionally, the timing of flights plays a role, with contrails formed during evening and night flights contributing the most to warming.Experts recommend integrating contrail avoidance into flight planning, likening this change to existing strategies that navigate storms and turbulence. “Of the climate solutions being proposed at COP29, this is arguably one of the simplest,” remarked Lopez de la Osa of the Transport & Environment campaign.As participants gather to discuss climate solutions, researchers emphasize that addressing the contrail issue could yield significant benefits for the environment without incurring substantial costs, juxtaposing it against the mountain of investment flowing into sustainable aviation fuels. They hope that by bringing this discussion to the forefront at COP29, greater awareness of both the problems and the solutions associated with contrails can be achieved.
