Gas naturally present in the atmosphere, accounting for approximately 0.036% of all of the atmospheric gases, and also emitted from the burning of fossil fuels and biomass, land use changes, and other industrial processes. It is one of the main greenhouse gases and is used as a reference to the other ones.
Anthropogenic emissions
Anthropogenic emissions
Emissions produced as a result of human action. For example, large amounts of carbon dioxide are being released into the atmosphere by activities such as the burning of fossil fuels, agriculture, cement making, and so on.