Global warming - the phenomenon of increasing average air temperatures near the surface of Earth , Atmosphere - the envelope of gases surrounding the earth or another planet., Troposphere - the lowest region of the atmosphere, extending from the earth's surface to a height of about 6–10 km, Methane  - is a colourless, odourless gas that occurs abundantly in nature and as a product of certain human activities, Greenhouseeffect - is a process that occurs when gases in Earth's atmosphere trap the Sun's heat, UVradiation - Invisible rays that are part of the energy that comes from the sun, IRradiation - is a type of radiant energy, with longer wavelengths than the visible light humans can see, CarbonDioxide - a colourless, odourless gas produced by burning carbon and organic compounds and by respiration, Watervapour  - It is one state of water within the hydrosphere, Ozone  - is a colourless gas which is a form of oxygen, Deforestation - the clearing or thinning of forests by humans, Fossilfuels  - is a hydrocarbon-containing material formed underground from the remains of dead plants and animals that humans extract and burn to release energy for use, Icemelting - change of a solid into a liquid when heat is applied, Photosynthesis - the process by which green plants and some other organisms use sunlight to synthesize nutrients from carbon dioxide and water., Clouroflourocarbons - are not toxic , not flammable chemicals containing atoms of carbon, chlorine, and fluorine.,

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