Vehicles Engineer for the Union of Concerned Scientists, Don Mackenzie reveals the greenest of all automakers (and not any one model, but the company top to bottom) in a recent UCS study. Envelope please…and the winner is: Honda, in a squeaker over Toyota! OK, so perhaps that’s not quite "Shakespeare in Love" over "Saving Private Ryan", but it is an indication that competition is bringing out the best in Japanese automakers (as well as rapidly improving Korean brands). Where are the Americans? I’ll let Don explain. LISTEN (7 min)