译林高中The Eviroment课文
The environment is the habitat of material life around us, where we can e, hear, touch, smell, and taste
According to Webster's dictionary, a system is defined as "a group or a ries of interrelated things that can form a whole or an organic whole", for example, solar system, irrigation system, supply system, world and univer.
Pollution is defined as "an undesirable change in the physical, chemical, or biological properties of the atmosphere, water, or land that adverly affects the health, survival, or activities of humans or other organisms".
When the goal of improving environme王羲之黄庭经
ntal quality is ud to improve human welfare, the term "environment" is expanded to include all social, economic and cultural aspects. This expansion is not feasible in many real situations and is not practical in a textbook designed as a one mester cour. Our investigation of environmental issues is therefore limited to our definition of "environment".
System interaction
Many different environmental problems are related to water, air or land systems. Many of the problems apply to only one of the systems, which provides a good reason for the breakdown of the categories. Such classification is also more uful and easy to understand the related problems within a system. Moreover, it is wi to do so becau, for management and administrative reasons, the sub domains related to air pollution, water supply, wastewater treatment and solid waste treatment are usually handled parately by government agencies.
Unfortunately, many important things Environmental problems are not only limited to air, water or land systems, but also include interactions between systems. For example, the acid rain problem originates from the sulfur dioxide and nitrogen oxides emitted into the atmosphere from the chimneys of power stations, smelters and automobile exhaust. Then the gas are transported to a wide area by air flow, and the rain "washes them away", producing acid rain harmful to aquatic life, forests and crops. The two environment
al problems caud by the interaction between systems are the global problem of increasing carbon dioxide in the air and the acid rain problem which usually has a regional nature.
environmental problems
Many of the major improvements in our living standards can be attributed to the application of science and technology. Here are some examples. Can you think of other examples?
Produce more and better quality food
Create a shelter and living space that can avoid extreme environment
Establishment of fast and reliable transportation methods
Invention of various AC systems
The invention of machines to replace human and animal physical strength
Safe water supply and waste disposal
Elimination of many infectious dias
Elimination of most water-borne dias through the application of improved water technologies in developed countries
Provide opportunities for cultural and recreational activities through better productivity and availability of leisure time.
Avoid the worst effects of natural disasters such as floods, droughts, earthquakes, and volcanic eruptions
