I'm not making the argument that grid-scale storage is currently feasible, but there are some really interesting developments on sand batteries, CO2 batteries,

I'm not making the argument that grid-scale storage is currently feasible, but there are some really interesting developments on sand batteries, CO2 batteries, and plastic batteries, among others. They're at various stages of development and all have unique pros and cons (cost, efficiency, longevity, scalability, etc), but I suspect renewables + storage will eventually prove to be exceedingly cost efficient once we figure out the "right" way to do them. Hydrocarbons have had centuries of process improvements and optimizations - I think it's only fair to give renewables a chance to catch up, no?