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Globally - every year we currently consume the equivalent of over 11 billion tonnes of oil in fossil fuels. Crude oil reserves are vanishing at the rate of 4 billion tonnes a year1 â if we carry on at this rate without any increase for our growing population or aspirations, our known oil deposits will be gone by 2052. Weâll still have gas left, and coal too.
Yrs. of oil left = # of barrels available / # of barrels used in a year. So if there are 150 million barrels of oil in the ground and we use 10 million a year, this type of thinking would suggest that the oil supply will run out in 15 years.redictions that we will run out of oil after a certain period of time are based on an ignorance of the economic way of thinking. The typical way to estimate the number of years it will take us to run out of oil is to consider the following factors: 1  The number of barrels we can extract with existing technology.