I'm not saying this isn't true. In fact, this has been my life's work (sustainable community design). It's not even a question of which one you do first, you can do both. What I'm saying is in the grand scheme of things, its more urgent to address emissions from passenger vehicles.And that is the problem. Our cities *were* built around mass transit, at least here in Boston. We had street cars connecting suburbs to the city. Modern train infrastructure for the period. All gone now, replaced by cars. Instead of realizing we cannot stuff more cars on the roads, we give people the sense of false responsible behavior when they sit in morning and evening traffic in their luxury electric cars. It just does not make sense from the environmental point of view, IMHO.