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Example: For an energy consumption of 21,500 MJ per year and a natural gas tariff of 2.1 cents per MJ ($0.021/MJ), the lifetime running cost is: 21,500 x $0.021 x 12 = $5,418 The labels can also be used to estimate the lifetime greenhouse gas emissions. For each MJ of gas consumed, around 0.06 kg of carbon dioxide is emitted, so for the example above the greenhouse gas emissions are: 21,500 x 0.06 x 12 = 15,480 kg or 15.48 tonnes The actual running costs and greenhouse gas emissions will depend