Going for C=0 is an impressively ambitious goal.
There is one thing I really like about this proposal. Gates believes our future depends upon scientific advances and resulting technological innovation, supported by modest and easy-to-justify infrastructure improvements. This breaks away from demand-side policy-centered approaches, yes. But more importantly -- to me, at least -- it breaks away from an over-reliance on old science.
To me, this emphasis on science AND technology -- rather than exclusively technology -- is perhaps an even more significant idea than primarily-supply-side thinking.
I think Gates' C=0 goal is probably the locus of this shift in thinking from "force mass deployment of existing technologies using the levers of policy" to "science the shit out of this, then innovate like madmen, and only then enlist public policy when it's truly the only missing piece (see: power grid example from article)".