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Slide 6. Global Carbon Emissions
CO2 is produced naturally by photosynthesis, volcanic eruptions, and other natural processes. Anthropogenic (man made) CO2 is caused by combustion of fossil fuels from mobile sources (planes, trains and automobiles) and stationary sources (power plants, refineries, chemical plants, iron and steel plants, cement plants, and natural gas processing plants). CO2 is required for life, is sold as a commodity for enhanced oil recovery and food production, and is also a greenhouse gas, which serves to hold heat and enhance warming. Anthropogenic emissions of CO2 are increasing in every major geopolitical sector, but most steeply in Asia.