You can't just put all solar panels in Sahara because of so many more important reasons, mainly energy transportation. Power lines will never be that efficient,

You can't just put all solar panels in Sahara because of so many more important reasons, mainly energy transportation. Power lines will never be that efficient, and battery storage would be prohibitively expensive (and I am not even sure there would be enough rare metals on earth to build that many batteries). We worked hand in hand with middle east dictators for centuries now, to get their oil. Oil is interesting because it is cheap to transport (pipelines).