Edexcel IGCSE Biology

Revision Notes

4.4.3 Deforestation


  • Deforestation is the clearing of trees (usually on a large scale)
  • If trees are replaced by replanting it can be a sustainable practise
  • Generally the trees are being cleared for the land to be used in a different way (for building, grazing for cattle, planting of monocultures such as palm oil plantations etc) and therefore it is not sustainable
  • As the amount of the Earth’s surface covered by trees decreases, it causes increasingly negative effects on the environment and is a particularly severe example of habitat destruction
  • Undesirable effects of deforestation include:
    • Extinction of species
    • Soil erosion
      • Which leads to leaching
    • Flooding
    • Increase of carbon dioxide in the atmosphere
    • Disturbance of water cycle

Consequences of Deforestation Table Effects & Consequences of Deforestation Table 1, downloadable IGCSE & GCSE Biology revision notes Effects & Consequences of Deforestation Table 2, downloadable IGCSE & GCSE Biology revision notes

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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.

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