Aviation remains one of the most challenging sectors to decarbonise, accounting for a growing share of global greenhouse gas emissions as passenger demand continues to rise. However, new research suggests that the industry could cut its climate impact by as much as half through a combination of technology, fuel innovation and operational change — without grounding fleets or curbing travel entirely.
The findings highlight three practical pathways that, if pursued together, could dramatically reduce aviation’s contribution to climate change over the coming decades.
1. Smarter Aircraft and More Efficient Operations
The first and most immediate opportunity lies in improving aircraft efficiency and flight operations. Advances in aerodynamics, lightweight materials and engine performance continue to reduce fuel burn per passenger kilometre. Newer aircraft models already emit significantly less carbon than those they replace, and further gains are expected as fleet renewal accelerates.
Operational improvements also play a critical role. Optimised flight paths, continuous climb and descent procedures, better air traffic management and reduced taxiing times can all cut fuel consumption. Small efficiency gains across millions of flights quickly add up, delivering meaningful emissions reductions without altering passenger behaviour.
2. Sustainable Aviation Fuels at Scale
The second — and potentially most impactful — lever is the widespread adoption of sustainable aviation fuels (SAF). Produced from renewable sources such as waste oils, agricultural residues or synthetic processes using captured carbon, SAF can reduce lifecycle emissions by up to 80 percent compared with conventional jet fuel.
While SAF is already in use on a limited scale, the study emphasises that rapid expansion of production and supply chains is essential. Cost remains a significant barrier, with sustainable fuels currently far more expensive than fossil-based alternatives. However, targeted policy support, long-term supply contracts and increased investment could help bridge the gap and make SAF a mainstream fuel option.
Crucially, SAF can be used in existing aircraft with minimal modification, making it one of the most viable near-term solutions for decarbonising long-haul aviation.
3. Tackling Non-CO₂ Climate Effects
Beyond carbon dioxide, aviation contributes to climate change through non-CO₂ effects, particularly contrails and nitrogen oxide emissions. These high-altitude impacts can trap heat in the atmosphere and, in some cases, contribute more to warming than CO₂ alone.
The study suggests that adjusting flight altitudes and routes to avoid atmospheric conditions that produce persistent contrails could significantly reduce warming effects with relatively modest operational changes. Advances in weather modelling and real-time atmospheric data make such strategies increasingly feasible.
Addressing non-CO₂ impacts has received far less attention than fuel emissions, yet offers a powerful opportunity for near-term climate gains if incorporated into airline planning and regulation.
A Combined Approach Is Essential
Importantly, the research makes clear that no single solution will deliver the required emissions reductions on its own. Instead, progress depends on combining efficiency improvements, sustainable fuels and smarter flight management into a coordinated strategy.
Technological innovation must be matched by policy frameworks that incentivise investment and adoption, while airlines, manufacturers and regulators align around shared climate goals. Long-term research into electric and hydrogen-powered aircraft also remains critical, particularly for short-haul routes, though these technologies are unlikely to scale fast enough to deliver major emissions cuts before mid-century.
The Road Ahead for Aviation
As global air travel continues to grow, the pressure on aviation to decarbonise will intensify. The study’s conclusions offer cautious optimism, demonstrating that meaningful emissions reductions are achievable without dismantling the global aviation system.
Halving aviation’s climate impact will require sustained commitment, collaboration and investment — but the pathways are increasingly clear. With the right mix of technology, fuel innovation and operational change, aviation could move closer to a future where mobility and climate responsibility are no longer at odds.