The average insolation on the surface of the earth on a cloudless day in the temperate regions is 800 w/m^2, over an 8 hour day about 7 Kwhr of energy would be expected to fall on every sq meter of earth.
Petrol has a HHV of 34 kwhr the max theoretical efficiency is around 90% for photosyntetic reasons so 6 sq meters of surface area would produce a gallons worth of fuel energy per day. The tropics have significantly higher insolation numbers almost 1000 w/m2 and 12 hour day light hours.
Every second of every day more solar energy falls on the surface of the earth than every gallon of fossil fuel humanity has ever burned in all of human history by a couple of orders of magnitude the amount of energy falling on the surface of the earth is staggering.
And if I could gather all the gold dissolved in the oceans, I would be rich beyond my wildest dreams. There is an entropy problem.