Post on 15-Apr-2017
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Chong Boon Secondary Sec 1 Geography Unit 3 Lesson 5Impact of Deforestation
2016
Objectives
1.What are the environmental impacts of deforestation?
2.What are the economic impacts of deforestation?
“The rainforests are the lungs of the earth”
• What do you think the above means?
• What will happen to you if you lose your lungs?
• Is it wise to continue our current rate of deforestation?
• Why do we still deforest?
Environmental Impacts
1. Loss of biodiversity2. Loss of water catchment3. Increased risk of flooding,
soil erosion and sedimentation
4. Enhanced greenhouse effect
Loss of biodiversity
•Destruction of habitats of (Flora) plants and (Fauna) animals.•Extinction of species•Loss of valuable resources•Food, medicine, timber wood
Loss of water catchment areas
• Forests enable water to be collected and stored• Removal of rainforests reduce water catchment• Available sources of water are reduced• Reduction in transpiration also affects seasonal
rains• Climate becomes drier with removal of trees that
serve to reintroduce water into the atmosphere.• Water prices will rise as a result
Flooding
•Removal of forests leads to more surface runoff•No vegetation to take up some of the
rain. •No roots to loosen the ground leads
to compacting of soil.• Infiltration is reduced.
Soil Erosion
•Higher levels of surface runoff increases erosion of top soil.•Roots help to hold soil in place•Deforestation leads to soil erosion when there is rain.•Landslides cause large scale damage and destruction.
Enhanced Greenhouse Effect•Greenhouse effect keeps our planet
warm.•Without greenhouse effect earth will
die.• Enhanced greenhouse effect leads to
rapid increase in temperature.•Without trees to recycle carbon
dioxide, the rise will lead to enhanced green house effect.
Economic Impact
Depletion of natural resources
• Tropical rainforest is an important natural resources.• It provides, resources for the people
who lived in the rainforest.•Rapid deforestation leads to loss of
the natural resource.• Timber extraction is the key reason
for deforestation.
Social Impact
Effects on indigenous people
•Indigenous tribes are displaced when the area is deforested.•Homes are lost and they are forced to learn a new lifestyle.•Traditional culture is also often lost.
Same issue different opinions
•The four groups have different opinions about the same issue.•Let’s take a look.
Pg 106
Let’s do a review exercise
•Take a look at the exercise given.