My bronze metal. This also wrestled with the wider issues and impacts. This had some of the best positive mechanics for alternate energy sources. Wind, solar, and hydro do not consume resources to operate, that's the big point, low/no pollution is the second point.
The option of strategically controlling resources to just prevent their exploitation is pretty cool. I feel like this has many good balanced concepts and will be very interested to see it fleshed out. I don't see any caveats where it is now.