Darkstone42
Oh.
I think the most immediate thing we could achieve on cutting emissions would be to ramp up the quality and comprehensiveness of public transit (and also make it free). If you can create a system sufficiently reliable that it's more convenient than driving, you simply get cars off the road for daily commutes, reducing emissions considerably that way. Not to mention that a comprehensive and reliable public transit system would reduce congestion on the roads, and improve access to jobs for poor folks who rely on it to get to work. Wins in several ways.