Carbon dioxide (CO2) is the most important greenhouse gas produced by human activities, primarily through the combustion of fossil fuels. Its concentration in the Earth's atmosphere has risen by more than 30% since the Industrial Revolution.
Respiration
Respiration, both on land and in the sea, is a key component of the global carbon cycle.
Vulcanism
Emissions of CO2 due to volcanic activity, though sometimes large on a local scale, are relatively minor on a global scale.
Land-use Change
It is estimated that man-made changes in land-use have, until now, produced a cumulative global loss of carbon from the land of about 200 Pg. Widespread deforestation has been the main source of this loss.
Energy - Stationary Sources
Of the carbon dioxide emissions arising from fossil fuel combustion
Industry (non-energy-related)
Carbon dioxide is produced in lime and cement manufacture as a result of the heating of limestone.
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