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Carbon dioxide (CO₂): Fossil fuel use is the primary source of CO₂. CO₂ can also be emitted from direct human-induced impacts on forestry and other land use, such as through deforestation, land clearing for agriculture, and degradation of soils

Fossil fuel use
Global Emissions by Gas

Carbon dioxide (CO2): Fossil fuel use is the primary source of CO2. CO2 can also be emitted from direct human-induced impacts on forestry and other land use, such as through deforestation, land clearing for agriculture, and degradation of soils.

Symptoms of mild CO2 exposure may include headache and drowsiness. At higher levels,rapid breathing, confusion, increased cardiac output, elevated blood pressure and increased arrhythmias may occur. Breathing oxygen depleted air caused by extreme CO2 concentrations can lead to death by suffocation.

These sources are present in three main areas: fuel combustion activities, industrial processes and natural- gas processing. The largest CO2 emissions by far result from the oxidation of carbon when fossil fuels are burned.

Carbon dioxide is produced by cell metabolism in the mitochondria. The amount produced depends on the rate of metabolism and the rel- ative amounts of carbohydrate, fat and protein metabolized.