Motor vehicles have helped, yes, but much more damage can be averted by shutting down any combustion-based power plants permanantly. There's many alternatives to power generation now that work, such as nuclear, solar, hydroelectric, wind, hydrogen fuel cells will also work on this level because their combustion outputes water and only water. Yes, autos did contribute, but at the levels they're currently at, they're nowhere near as bad as they used to be. I'd say if they shut down the CO2 emitting power facilities, there'd be a noticeable drop in national CO2 belching-out. Seriously, people, go nuclear, we've gotten auto emissions as low as financially feasible...
And yes, I support using hydrogen in place of gasoline because it produces only water as emission, and can be used in current piston engines with no internal mods. All one needs to do is replace gas with H2, retime, adjust fuel mix and go!
And yes, I support using hydrogen in place of gasoline because it produces only water as emission, and can be used in current piston engines with no internal mods. All one needs to do is replace gas with H2, retime, adjust fuel mix and go!