Greenhouse Gas

The two most major greenhouse gases in the atmosphere today are carbon dioxide, which is controlled by the carbon cycle and water vapour, which is controlled by the hydrologic cycle.

Other major greenhouse gases include methane, nitrous oxide, hydro-fluorocarbons (HFCs), halons, carbon tetrachloride and hydro-chlorofluorocarbons (HCFCs). All these emissions come from human sources e.g. carbon dioxide is emitted in large quantities by fossil fuel burning and deforestation.

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