Take CO2 from the Air, combine it with Hydrogen extracted from Water ( using renewable energy) and you can make various fuels like ethanol, diesel, kerosene, petrol and aviation fuel. Fuels made like this can notionally get to Net Zero, although are more likely to generate 90% fewer emissions than the conventional hydrocarbons. Still pretty good, and another benefit is they work without needing expensive modifications to the car or plane.
https://carbonengineering.com/news-updates/ce-lanzatech-jet-fuel/