A barrel of oil does 11 years of human work, but humans are more efficient. We use around 30 odd billion barrels of oil per year. If you translate how much coal and natural gas we use per year, it works out to otone hundred billion barrel of oil equivalents of fossil heart carbon and hydrocarbons every year. Add four to five years of human labor per barrel. That's around 500 bill an human labor equivalents added to our economy with five billion real workers. The word energy as a contributor to the market development, the market efficiency, the productivity of our world, our wealth was never mentioned.