E fuels can be 0 carbon. But they are still bad for air quality because of oxidizing Nitrogen during combustion. These Nitrous oxides then react in the atmosphe

E fuels can be 0 carbon. But they are still bad for air quality because of oxidizing Nitrogen during combustion. These Nitrous oxides then react in the atmosphere with other compounds (even terpenes from forests) then form the small particles (PM2.5) that we now know are deadly because they pass though all of our body barriers. The way I see it is that efuels will eventually be there to satisfy the demand of legacy hardware in the transition period, and maybe a bit later for recreational purposes (aka for car collectors, racing etc). They are not a permanent solution for our transportation energy needs.