Deforestation (AQA GCSE Biology)
Revision Note
Written by: Lára Marie McIvor
Reviewed by: Lucy Kirkham
Deforestation
Deforestation is the clearing of trees (usually on a large scale)
If trees are replaced by replanting it can be a sustainable practise
Unfortunately, this is not often the case and unsustainable deforestation is occurring in many places (forests are being cut down faster than they can regenerate)
Unsustainable deforestation is occurring on a large scale in the rainforests of tropical areas for various reasons including:
To provide more land for farming (eg. cattle and rice fields)
To grow crops from which ethanol-based biofuels can be produced
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
Loss of soil
Flooding
Increase of carbon dioxide in the atmosphere
Consequences of deforestation table
Examiner Tips and Tricks
The two main reasons deforestation occurs in tropical areas is for farming and growing biofuel crops. However, you may be asked why deforestation takes place more generally (not specifically in tropical areas). For this question, the following answers are acceptable:
To provide land for farming/agriculture
To provide land for quarrying
To provide land for building
To provide wood for building materials
To provide fuel
To provide paper
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