土地荒漠化英语Presentation

The annual direct economic losses caused by desertification disasters amount to 120 billion yuan.
Causes of formation
Natural factors: drought, location human factors: Over reclamation, overgrazing, excessive logging, irrational use of water resource, rapid population growth( the most basic)
What is desertification?
• In 1949, A. Aubreville thought that the African tropical forest line had receded 60400 km
•
1960s-1970s, a particularly severe drought in western Africa accelerated the desertification process in the region.
Measures
Reduce damage to the pasture. Control the rapid growth of the population and continuously improve the quality of the population.
Industrial restructuring.
The land Human beings
Others problems
PART 1
A serious loss of land
“The desertification area in the world is between 6,000,000 Km2 and 1,200,000 Km2.”
PART 2
•
1968-1974, a particularly severe drought in the Sahara region of Africa, claiming the lives of 200,000 people and millions of animals.
What caused the dertification in Africa?
01 02
Human factor
Desertification can be caused by too much use of land and inappropriate management of soil in semi-arid areas.
THE CURRENT IMPACT IN THE WORLD
PART 3
Others problems
It also has caused others
environmental problems and adversely affected other areas away from the desertification region.
02
Asia
China
A threat to human beings
It is difficult for people to obtain clean drinking water and adequate sanitation measures, which increases the probability of deterioration of their health status.
Fighting against global desertification
Wang siyuan, Yang yuqin Cai shuman, Juyeong
C
O N T E N T S
01
Introduction
the reason and the impact
02
The example Asia Conclusion
Measures
Develop breeds that suits well in
desertification and has a diverse genes that can protect tropical forest
Use technology that analyze the process, change and interrelationship of other factors that associated with
desertification
04
Conclusion
References
1. http://www.downtoearth.org.in/news/desertificationin-africa-10-things-you-must-know-54430
2. http://www.cctv.com/special/586/1/30659.html
03
The example Afica
04
01
Biblioteka Baidu
Introduction
the reason and the impact
THE REASON
Natural factor
Desertification can be caused by the decrease of rainfall and high temperature and others elements of climate.
Strengthen international exchanges and cooperation in combating desertification .
03
Africa
• 20,000 hectares per year • 319 million hectares in total
Protect existing vegetation and strengthen forest and grass construction. A long-lasting ecological revolution has been carried out in desertification areas to reverse the desertification process.
Influences
• over 50 million people could move from the degraded areas of subSaharan Africa to North Africa and Europe by 2020.
Influences
Preserve tropical forest & agree on agenda
THANKS
most of the affected countries are poor countries, and public infrastructure construction is not perfect
• Among the 21 countries in the Saharan arid region, more than 35 million people were affected during the peak drought in the 1980s, and more than 10 million people have left their homes to become “ ecological refugees ” .
arid areas of Africa have been getting drier for almost 5,000 years
poverty-related agricultural practices are a major contributor to desertification
In Asia,400 million people live in desert or arid lands, and the area of dry land increases by about 2,500 square kilometers annually.
China is one of the countries with severe desertification in the world.