I think humans can progress on that scale, but I also think we need to do it the human way. That is, the scenic route if you will, the longer way. If we can jus

I think humans can progress on that scale, but I also think we need to do it the human way. That is, the scenic route if you will, the longer way. If we can just nibble our way to full coverage (of roof tops in this case) faster than we put up new roofs, I think we'll be fine. Utility solar will follow eventually. Also, and this also ties in to mankinds irrationality - say there is some kind disaster or bombing campaign. I fully believe roof top, i.e. decentralized power generation must be more robust than utility solar.