Energy density can't be ignored here. Fossil fuels are definitely finite, and few things match their energy density and general utility. Our environment is wa

Energy density can't be ignored here. Fossil fuels are definitely finite, and few things match their energy density and general utility. Our environment is warming, and we need to bootstrap ourselves onto other energy now, while we have fuels and quick or we may find ourselves energy constrained and fighting the battle in a far less livable place.