Cars itself are actually only a small part of climate change. The major part of it is form construction, planes, and electricity. We can fix electricity with sustainable energy, fixing planes is a lot harder as of now. Fixing construction seems impossible for now.
We’ll run out of time before we we hit zero. We are already too fast to break before the cliff. All we can hope for is a soft landing, and we need everything for that. Even nuclear energy (go 100% on nuclear!)