[Big Dave]

Zero fossil fuels in you grandchildren's lifetime is probably a pipe dream.

Engineers say the perfect is the enemy of the good enough.

Going directly to non-fossil fueled vehicles is probably a bridge too far.

But there are a lot of partial measures to use to assure a prosperous transition.

1. We could at least partially beat the battery/recharging problem by using direct catenary electrification of railroads and long-haul truck. Electrified railroads are a long proven alternative. The Russians manage to operate 10,000 km of fully electrified railroad from Ekaterinberg to Vladivostok. Yeah, they power it with roadside coal plants but they also have plenty of natural gas.
A European consortium is experimenting with electrified eighteen wheelers in Scandanavia. I see no reason it can't work. All the tech is well-proven old-school stuff.

2. The US could substantially reduce its "carbon footprint" by transitioning independent IC motor vehicles by converting much of the transportation system to running on CNG or LPG - supplanting gasoline, ethanol, and diesel. Natural gas emits 60% less CO2 (in lb CO2 per HP-hr than gasoline or diesel. Don't believe that? Peruse EPA Publication AP-42. A night time satellite phot of the northern US shows a light signature nearly as big as Chicago out in the Dakotas. That's flaring of gas needed for pressure control of the wells. Just by building enough pipelines to market areas that flared gas could be compressed/liquified natural gas to run millions of vehicles. Just reducing CO2 by 60% from say ten million vehicles is quite a bit of progress.

Considering the most recent IPCC GHG emission inventory showed that China emits more GHG than the rest of the world combined - and that includes the US. If we cannot get China on-board, what's the point of impoverishing everyone else?

BTW, I am STILL of the opinion that Global Warming is an elitist scam.