>It won't change the CO2 emissions created by home and commercial heating, agriculture, and industrial uses, which add up to another 3.5 or so gigatons.
So address each one in turn, or in parallel. You give no reason not to.
Lot of people use the 'golden hammer or nothing argument'
Meaning if a proposed solution is partial then we shouldn't do anything. It flies in the face of the reality that most solutions to complex problems involve chipping away at them.
Currently there is a host of technologies which emit to much CO2. Personal transportation is just one of them.
So address each one in turn, or in parallel. You give no reason not to.