I think this is less true for purely renewable grids separated by large continents. The amount of concrete and steel needed to move solar from the Sahara to Fin

I think this is less true for purely renewable grids separated by large continents. The amount of concrete and steel needed to move solar from the Sahara to Finland makes the energy very much not green anymore. Petro energy- natural gas, diesel plus coal- don't really concern themselves with CO2 and can use existing transportation to get to remote areas, so the energy produced is very much more fungible on a global scale.