Atmosphere - The envelope of gases above the Earth’s surface, Oxygen - The gas that makes up around 21 %  of the Atmosphere, Photosynthesis - A biological process that absorbs carbon dioxide from the atmosphere, Respiration - A biological process that releases carbon dioxide into the atmosphere, Carbon dioxide and methane - Example of a greenhouse gas, Emission - The production and release of a gas, Deforestation. - The large scale cutting down of trees, Weather - The local temperature, wind and rainfall over a short time period, Climate - The long-term pattern of the weather, Arctic and Antarctic - Polar regions where ice caps are melting more quickly due to global warming,

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