What Would Be The Surface Area Of Solar Panels That Would Be Needed To Power The World?

An area of 254 km x 254 km as shown in the map above covered in concentrated solar power (CSP) plants will hypothetically be enough to power the entire world. Every year each square kilometre of hot deserts receive solar energy equivalent to 1.5 million barrels of oil (about 240 million litres). You can find the area to substract from the above (if all automobiles were to use solar power instead of oil) by finding out the consumption of oil per year by automobiles.