According to the International Energy Agency the proven reserves of coal are around 909 billion tonnes , which could sustain the current production rate for 155 years .
At a 5 % growth per annum this would be reduced to 45 years .
According to the International Energy Agency the proven reserves of coal are around 909 billion tonnes , which could sustain the current production rate for 155 years , although at a 5 % growth per annum this would be reduced to 45 years .