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

http://www.youtube.com/watch?v=YkM6iU1v_2Y

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.

http://www.youtube.com/watch?v=_VIKfZWF-7I

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.

http://www.youtube.com/watch?v=Bh4IiMF3lqc

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.

http://www.youtube.com/watch?v=2taViFH_6_Y

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.