We would have inefficient and polluting engines, leaded gasoline, steam engines burning coal, no high performance plastics, and probably more even wars around oil and gas and slower economy leading to less resource to fund battery research...

I mean, batteries and solar panels are cool, but thinking about the future doesn't mean we should forget the present. The advance we could have gotten by diverting funding away from fossil fuels and towards renewables and batteries is to balance with the damage caused by using outdated fossil fuel technology before the transition.

Cities are breathable now thanks to all the progresses modern engines have made. They will be even more breathable with zero emission cars, but I prefer to wait a bit more in these conditions than waiting a bit less in a smog filled city.