Or working on Fusion :-) You know without any energy generation limitations, I once calculated that we could grow enough food to feed the world in less than 10

Or working on Fusion :-) You know without any energy generation limitations, I once calculated that we could grow enough food to feed the world in less than 10000 skyscraper farms and return all those millions of hectares of cropland, pastures and plantations that we have terraformed over thousands of years to nature.