2016 Sec 1 T2Wk2 Pre-learning slides

1. Chong Boon Secondary
Sec 1 Geography Unit 3
Lesson 5
Impact of Deforestation
2016

2. Objectives
1.What are the
environmental impacts of
deforestation?
2.What are the economic
impacts of deforestation?

3. “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?

4. Environmental Impacts
1. Loss of biodiversity
2. Loss of water catchment
3. Increased risk of flooding,
soil erosion and
sedimentation
4. Enhanced greenhouse effect

6. Loss of biodiversity
•Destruction of habitats of (Flora)
plants and (Fauna) animals.
•Extinction of species
•Loss of valuable resources
•Food, medicine, timber wood

8. 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

10. 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.

12. 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.

14. 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.

16. Economic Impact

17. 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.

19. Social Impact

20. 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.

21. Same issue different opinions
•The four groups have
different opinions about
the same issue.
•Let’s take a look.
Pg 106

22. Let’s do a review exercise
•Take a look at the
exercise given.