To be the best, look around at the competition (friendly competition -- the other green cities of the world), and make sure you're at least matching the best policies out there.
For instance a number of cities in Switzerland have put 2000 W mandates in their charter. A "2000 W society" is a nice framing of the common objective of averaging less than 2kW per person. A 1 t (ie per year, per person, of CO2e GHGs in this case) society might be more climate relevant.
Duane Elverum commented
This is interesting Chris. It's a vision that is understandable and measurable, and attainable.