Alternative jet fuels (AJFs) are among the few available in-sector approaches to reduce aviation sector emissions. Although the aviation sector has not played a prominent role in fuels policy to date, policymakers are increasingly incorporating aviation fuels into long-term strategies as the road sector is electrified.

Renewable methane could conceivably displace natural gas for use in existing vehicle fleets, reducing greenhouse gas (GHG) emissions as well as emissions of air pollutants like NOx. It is important that policy makers assess the realistic potential for renewable methane.