Fossil fueled cars aren't going to get that much more efficient in the foreseeable future, especially since manufacturers know they are a dead horse.

So what do you propose for that sector? Banning driving? And that's then easier than banning private flying, despite far more people relying on it every day, it being far more decentralized and far harder to regulate for that reason? Globally, at that? I mean of course we should improve public transit to make it a better alternative, but that's an equally monumental task that will take decades in most places.

Air travel is definitely a lower hanging fruit as for the majority of people it's a luxury, not a necessity.