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  • Global warming - The rise in overall temperature of the earth because of the green house effect is referred as global warming.
  • Air pollution 
    • The layer of air present around the earth is called atmosphere.
    • Atmosphere is composed of 78% of nitrogen, 21% of oxygen, and 1% percent other gases such as carbon dioxide, ozone, water vapour, methane, etc.
    • The phenomenon of contamination of air with unwanted substances so that it becomes harmful for living organisms and non-living substances is known as air pollution.
    • The substances, which cause air pollution, are called air pollutants.
    • Sources …

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