Everyone's favorite McKinsey study suggests that America can shed a huge chunk of its emissions through costless measures, primarily in the realm of energy efficiency. The fly in this delicious low-carbon ointment is that the freebie cuts haven't so far happened by themselves, and it's never entirely clear how well an analyst's report is going to translate into reality. How nice, then, that New York City is gearing up to provide the proof point we've all been waiting for. ...