Greenhouse Gases (Edexcel IGCSE Biology)

Revision Note

Greenhouse Gases

  • A greenhouse gas is a gas that absorbs infrared radiation from the Sun so it remains trapped in the Earth’s atmosphere

  • This is important to ensure Earth is warm enough for life, however if levels of these gases in the atmosphere increase it leads to an increase in the greenhouse effect which causes the Earth’s average temperature to rise

  • There are many greenhouse gases, the most important are:

    • Water vapour

    • Carbon dioxide

    • Methane

    • Nitrous oxides

    • CFCs

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Human Activities & Greenhouse Gases

  • Human activities have led to increasing levels of carbon dioxide and methane in the atmosphere:

    • Carbon dioxide is produced during the combustion of fossil fuel

    • Methane is produced by cattle as they digest grass and released by rice paddy fields

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Lára Marie McIvor

Author: Lára Marie McIvor

Expertise: Biology Lead

Lára graduated from Oxford University in Biological Sciences and has now been a science tutor working in the UK for several years. Lára has a particular interest in the area of infectious disease and epidemiology, and enjoys creating original educational materials that develop confidence and facilitate learning.