I agree with the methology of this approach, but disagree in practicality. In my area, Many new housing and apartment complexes are being built near places of commerce. But that leaves everyone else who lives elsewhere in the same situation as before. I don't think it has to be an either/or approach. in addition to these walkable/bikeable solutions we should also be reducing the need to go out in the first place. Telecommuting, grocery delivery with electric vehicles, and teledoc appointments all help with the environmental impact as much as electric vehicles do. Hybrid vehicles should also be part of the conversation.