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It is not a secret that the fuel industry has an extremely harmful impact on the environment. The greatest damage to the environment is done by carbon emission. This is also known as the greenhouse effect. Excessive emission of carbon dioxide (CO2) arises from various fuel types like coal, oil, gas, and gas flaring. As energy systems have evolved throughout history, the contribution of different fuel types to CO2 emission has also transitioned geographically and temporally. Here are the largest carbon emitters in the fuel industry: