People especially Americans, do not like the government telling them what they can and can't do to their own property. Also the small local governments have limited funds, such actions will mean that the local government will need to make a serious sacrifice.
Local governments can change local building codes to require all new construction to fit the guidelines for albedo modification. Done.
Yeah, it won't affect existing infrastructure, but in the long term (and with AGW we're talking long term, or should be), it'll have the desired effect.
Assuming, of course, that the albedo-modification theories are correct in the first place.
Yes, I know that modifying the albedo will do what we want. What I wonder about is whether we can effectively modify the albedo in a controlled fashion.