In a perfect world, why would electric cars be emitting any CO2? A carbon neutral electrical production is clearly possible right now with enough investment an

In a perfect world, why would electric cars be emitting any CO2? A carbon neutral electrical production is clearly possible right now with enough investment and we're moving in that direction now because it's profitable. Carbon neutral steel is currently expensive but people are working on that. Likewise with the cement and other materials going into the roads. The big impediment I see is that the plastic that goes into a car isn't easy to replace and will decay after the car breaks down, but if we create it via direct air capture and synthesis that doesn't prevent a carbon neutral car. So what do you see as preventing us from getting to carbon neutral cars?