It takes 53 years until we run out of gas.
Given,
Reserves of natural gas = 6500 TCF
Consumption per year = 123 TCF
Therefore,
years left ( x )= Reserves of natural gas / Consumption per year
= 6500/123
= 52.8 years
x = 53 years approximately
So, it takes 53 years until we run out of gas at this rate of consumption.
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