non sequitur

No it's not. If you want to lower the CO2 in the atmosphere then you need to break up the carbon bonds, that leaves you with carbon. For all I care you make diamonds out of it, it's irrelevant. If you want to break CO2 in O2 you need to spend that same energy. That was my point. If them youale fuel or whatever out of it that is a wholly different story that too will require yet more energy.

Trains indeed resolve the long haul truck issue but they're hardly anywhere in the US. Good luck with building new train tracks there.

We haven't had an electrical fire in a tunnel yet. Fires in tunnels are bad but can be controlled. Electrical battery fed fires are a nightmare as they have all the ingredients to keep going all by themselves. This is why fire departments see these cars as a problem as they require more water to put out than they can carry.

Li-ion batteries are indeed volatile and no they won't explode by the thousands but if you have hundreds of millions of them, then statistically yes, you will get thousands of fires world wide every day. Tunnel fires are just a waiting to happen. I'm not saying there is no solution, but it IS a huge problem.