Carbon emissions is why we're transitioning. Its why EVs are made mandatory. Its the premise that the EV has to fulfill. Thousands of little ICE parts have little consequence since cars, typically, die for every other reason except engine failure. This has been the case since widespread adoption of automatic transmissions and fuel injection.

The math of EVs is pretty daunting too. Take an EV and ignore its greater sin of creation (ie resources to make one vs an ICE car). Now pretend it runs on pixie dust (ie actually zero emissions).

Now compare that to taking that EV's (electrically) massive battery and, instead hybridizing N number of vehicles. Ive run the numbers, and the EV has (much) greater CO2 emissions.

If you use regulatory power to funnel those batteries to preferentially hybridize contractors' vans and trucks (ie the F-250 and 350, not the wanna be cowboys' 150) the comparison sucks even more.

Note that this analysis uses efficiency numbers from current widespread ICE engines, not rather niche (for the West) CNG cars that can run at very high compression ratios (methane has an octane rating of about 120) and have much higher energy content per gram of CO2.

And you know what the funniest part of all of this is? We could slash transportation CO2 overnight by lowering and imposing lower speed limits.

But again, this is what Ive come to believe with car manufacturer and EPA data in excel. YMMV