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CO2 emissions when burning fossil fuels (coal, oil, gas) and is the source of greenhouse gases caused by humans primarily in the atmosphere. CO2 is also generated from industrial activities such as the production of cement and steel. CH4 generated from the landfill, food fermentation in the gut, ruminants in natural oil, gas and coal mining. N2O emissions from fertilizer and industrial activities. HFCs are used in place of the ozone destroying substances (ODS) and HFC-23 is a byproduct of the production of HCFC-22. PFCs from aluminium production process. SF6 use in electrical insulating materials and magnesium production processes.
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