Global warming - A gradual increase in the overall temperature of the earth's atmosphere., Combustion - The process of burning fossil fuels for the purpose of producing energy, Acid rain - Rainfall made so acidic by atmospheric pollution that it causes environmental harm, chiefly to forests and lakes., Photosynthesis - A process that takes in the carbon dioxide produced by all breathing organisms and reintroduces oxygen into the atmosphere., Respiration - A process in living organisms involving the production of energy, typically with the intake of oxygen and the release of carbon dioxide from the oxidation of complex organic substances., Fossil fuels - This is formed by natural processes, such as the decomposition of buried dead organisms, containing energy originating in ancient photosynthesis.,

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