Atmosphere, The layers of gases that surround the Earth. Nitrogen, oxygen and carbon dioxide are the important ones., Carbon footprint, The total amount of greenhouses gases that are caused by a person, product or organisation. It is also the measure of carbon dioxide and methane within a population., Climatologist, An expert who studies the climate., Fossil fuels, Natural, finite fuel. Eg oil, coal and natural gas., Global warming, the unusually rapid increase in Earths average surface temperature over the past century, Greenhouse gas, The gases responsible for global warming - carbon dioxide, methane, nitrous oxide and CFCs (chlorofluorocarbons)..

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