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Ana de Castro

on 19 November 2015

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Transcript of Deforestation

Deforestation can cause flooding
The ground in the forest is like a sponge it can absorb a lot of water
Trees slow down water rundown
Cutting the trees will change the soil such that it can store less water
Rain water will just rundown quickly into rivers to cause flooding and erosion
It’s currently estimated that the world is losing around 137 plant, animal and insect species every day due to rainforest deforestation
Currently 50,000 species are going extinct every year
Genetic diversity is lost if many species become extinct
99% of all species that have ever existed are now extinct
Up to 28,000 species are expected to become extinct by the next quarter of the century due to deforestation.
Cover 31% of the planet
Oxygen from photosynthesis
Homes for animals and humans.
Money forests are very important to humans
1.6 billion people rely on benefits forests offer
Food, fresh water, clothing, traditional medicine (121 remedies) and shelter
25% of cancers fighting organisms are found in the amazon
Deforestation comes in many forms: fires, clear cutting for agriculture, ranching and development, unsustainable (sometimes illegal) logging for timber, and degradation due to climate change.
17% of Amazon has been lost in the past 50 years
In 100 years there will be no forests
What is it?
: deforestation is the clearing of trees, transforming a forest into cleared land.
7.3 million hectares
of forest (size of Panama) are lost each year
20 football fields
worth of trees lost every minute
According to the FAO (food and agricultural organization)
of the trees have been cut down in: Canada, USA, Peru, Brazil, Congo, Nairobi, Indonesia, Australia, China and Russia

Flooding: How is it caused
Loss of soil
Impacts of flooding
By Oliver, Emilien and Ana
Floods can destroy houses, farms, vehicles and building
This can leave families homeless and people jobless
The total cost of floods in 2011 was 8.5 billion dollars
Flooding also kills animals and introduces insects to
new areas which can distort the balance of the ecosystem
Developing countries are more affected by floods than developed countries due to having more farms and fewer resources to prevent floods
Examples: Bangladesh flooded in 1998, millions affected

Deforestation causes soil to erode
Tree roots protect the soil from wind and water erosion
When trees are cut down the dirt moves when it rains and follows the direction the water is running, causing erosion.
As floods are caused by deforestation, there would be even more loss of soil
Impacts: flooding, less farmland, polluted waters from fertilizers
Example: Amazon, Yangtze river
There are many reasons why forests on earth are all disappearing
Lots of people are willing to kill so many of these trees to use the tree for its wood and many of its other useful resources
Whole forests of trees are being cut down to make room for more humans, roads, and even bigger cities
Oil and coal mining use a large amount of forest land and the waste from the mining pollutes whatever tree thats been spared from being chopped down
Climate change is the No. 1 problem caused by deforestation
Climate Change
Greenhouse Gases-
Gas molecules that absorb thermal infrared radiation
Carbon dioxide is the most abundant gas in the earth's atmosphere
Trees help to lessen and control the amount greenhouse gases in the air, especially carbon dioxide, but without the trees to do this job all of the stored carbon and gases are released into the atmosphere
3 billion tons of carbon dioxide is released into the air
Numbers have started to go down as deforestation decreased, but not by much
In this photo you can see where climate change is at its worst, specifically Brazil, Central America, South and Central Africa, and Australia.
The places where deforestation is the biggest issue is the same places as climate change is an issue. This is showing that climate change is a major effect of deforestation.

Loss of soil

Climate change
Carbon cycle
Full transcript