Well first of you'd have to reduce that by the efficiency of our panels, so we're down to 20 petawatts And then you'd have to factor in the fact that basically

Well first of you'd have to reduce that by the efficiency of our panels, so we're down to 20 petawatts And then you'd have to factor in the fact that basically none of the planet can be covered in solar panels And then the fact that you wouldn't be able to efficiently transport the energy to where we need it So yes in theory you put a couple hundred sqkm of solar panels in the Sahara and you're golden, in practice it's much more complex