DesertificationDesertificationDesertificationDesertification

Speaker: Cheng JingxiaSpeaker: Cheng Jingxia

Group : 13Group : 13

Contents

1. The current situation of desertification

2. The cause of desertification

3. The harm of desertification

4. How to prevent and control the

desertification?

Definition

Desertification is arid, semi-arid and

dry sub-humid areas of land

degradation , which caused by various

factors, including climatic variations

and human activities.

Current situation

Desertification is a worldwide

ecological environmental problem.

Over 100 countries were affected by

desertification. There are more than

12 million people have been

suffered the direct threat of

desertification. Although the

people of all countries are going to

fight against desertification, but

desertification is

expanding at

the speed of 50 to 70 thousand square

kilometers a year.

The global desertification has reached

36 million square kilometers,

accounting for 1/4 of the entire Earth's

land area,

which is equivalent to the sum of

the land area of Russia, Canada,

China and the United States.

Throughout the world, the

economic losses caused by the

desertification has reached 42

billion dollars each year.

In China

China is one of the countries which is the mos

t seriously affected by desertification. The ar

eas of desert, Gobi desert and desertification

land in China are about 1.7397

million square kilometers, the part of

modern desertification land caused b

y human activities is about 370,000 sq

uare kilometers, sand desertification

caused direct economic losses is mor

e than 54 billion yuan each year.

Desertification in China are

mainly distributed in Xinjiang and

Inner Mongolia, Tibet, Qinghai,

Gansu provinces.

The cause of desertification

1. Abnormal climate changing

2. Unreasonable land clearing

3. Overgrazing

4. Unreasonable dredging and tree felling

5. Water resources wasting

The harm of desertification

1. deteriorating the ecological

environment, affecting people's

lives, threatening human health.

2. Directly affecting agriculture,

production and life

3. Causing significant economic losses,

and impeding economic development

4. Exacerbating poverty level

Measures

1. Wind sheltering and sand fixation

2. Treating plants, expanding the

proportion of grass, building

protection system

3. Rational developing and utilizing of

water resources

4. Controlling the land reclamation,

protecting vegetation, non abusing

deforestation

5. Improving the protection of the legal

system, deepening the prevention

publicity and education.

6. Establishing a national

desertification prevention and

control team.

7. learning the advanced experience

about sand control from foreign

countries.

Sahara

It is the world's largest desert,

located in the south of the Atlas

Mountains and the Mediterranean,

west from the Atlantic Coast,

east to the Red Sea coast, across

the continent northern, up to 5600

km from east to west, north to

south width of 1600 km, the area

of

approximately 9.6 million square

kilometers, accounting for 32% of

the total area in Africa.

Governing desert is a long way to

go.

  Need our unremitting efforts!