I get it, but I'm more concerned with the everyday interactions of exhaust and fumes. I'm probably just prissy (not that there's anything wrong with it!) and a touch short-sighted.
Regardless, I'm all electric and can't wait to configure an R1T!
Maybe I'm an idiot, but I'm more concerned with/by the other toxins that are bi-products of the creation and use of fossil fuels than I am about CO2. Still environmental, but a slightly different concern.