环境恶化案例分析ppt课件

1、The Deterioration of Our EnvironmentPresented by Qi YaweiExample 1 The Aral Sea The Aral Sea located in Uzbekistan and Kazakhstan,is historically a saline lake. It is in the centre of a large,flat desert basin. The Aral Sea is a prime example of a dynamic environment. In 1960 it was the worlds fourt

2、h largest lake , the size of the entirety of Southern California. The eco-system of the Aral Sea and the river feeding into it has been nearly destroyed, not least because of the much higher salinity. The receding sea has left huge plains covered with salt and toxic chemicals the results of weapon t

3、esting, industrial projects, pesticides and fertilizer runoff which are picked up and carried away by the wind as toxic dust and spread to the surrounding area. The land around the Aral Sea is heavily polluted and the people living in the area are suffering from a lack of fresh water and health prob

4、lems, including high rates of certain forms of cancer and lung diseases. Respiratory illnesses (most of which is drug resistant) and cancer, digestive disorders, anaemia, and infectious diseases are common ailments in the region. Liver, kidney and eye problems can also be attributed to the toxic dus

5、t storms. Health concerns associated with the region are a cause for an unusually high fatality rate amongst vulnerable parts of the population. Reasons : In the early 1960s, the Soviet decided that the two rivers that fed the Aral Sea, the Amu Darya in the south and the Syr Darya in the northeast,

6、would be diverted to irrigate the desert, in order to attempt to grow rice, melons, cereals, and cotton. Solutions: Improving the quality of irrigation canals; Installing desalination plants; Charging farmers to use the water from the rivers; Using alternative cotton species that require less water

7、Using fewer chemicals on the cotton; Moving farming away from cotton; Installing dams to fill the Aral Sea; Example 2the Amazon Rain Forest It contains about a third of the Earths remaining tropical forest. It has a high portion of its biological diversity. But it is being destroyed. Reasons:The mai

8、n sources of deforestation in the Amazon are human settlement and development of the land.The first two highways successfully opened up the rain forest and led to increased settlement and deforestation. The development of agricultural there which needs more land for planting. Solutions: 1.stop the e

9、xploitation here immediately. 2.help local people develop new ways of making a living. 3.issue new laws to protect the forests here and stop the wood transaction 4.restrain human activities here. One swallow does not make a summer. 一燕不成夏。一燕不成夏。 Taverner 泰维纳泰维纳 唯有了解，我们才会关怀；唯有了解，我们才会关怀；Only if we understand can we care. 唯有关怀，我们才会采取行动；唯有关怀，我们才会采取行动；Only if we care will we help. 唯有行动，生命才会有希望。唯有行动，生命才会有希望。Only if we h