洛杉矶assignment代写 Ecopoetics Assignment On Pollution Environmental

污染是在我们的环境中的不受欢迎的变化对植物，动物和人类产生有害影响的影响。这种情况发生时，只有短期的生态效益，在长期的生态效益为人类的成本。在过去的几十年里，我们已经污染了我们的空气、水和土地，生命本身就取决于各种各样的废物。
从生态角度来看，污染物可分为可降解或非持久性污染物可迅速分解的自然process.eg：生活污水、废弃的蔬菜等，或是缓慢降解持久性有机污染物的污染物留在环境中许多年不变的条件和需要几十年或更长的时间才能降解。例如：DDT（农药）和大多数塑料。不可降解的污染物不能通过自然过程退化。一旦被释放到他们的环境很难根除，继续accumulate.eg：有毒元素如铅、汞和核废物。

Pollution is the effect of undesirable changes in our surroundings that have harmful effects on plants, animals and human beings. This occurs when only short term ecological gains are made at the cost of long term ecological benefits for humanity. During the last few decades we have polluted our air, water and land on which life itself depends with a variety of waste products.

From an ecological point of view, pollutants can be classified as degradable or non-persistent pollutants which can be rapidly broken down by natural process.eg: domestic sewage, discarded vegetables etc., Slowly-degradable or persistent pollutants are pollutants that remain in the environment for many years in an unchanged condition and take decades or longer to degrade.eg:DDT(pesticides) and most plastics. Non-degradable pollutants cannot be degraded by natural processes. Once they are released into the environment they are difficult to eradicate and continue to accumulate.eg: toxic elements like lead or mercury and nuclear wastes.

Pollution is a very wide topic. This thesis focuses on two major pollutions- air and water, and explains in detail the causes, effects and control measures.

Air pollution occurs due to the presence of undesirable solid or gaseous particles in the air in quantities that are harmful to human health and the environment. The air may become polluted by natural causes such as volcanoes, which release ash, dust, sulphur and other gases, or by forest fires that are occasionally caused by lightening. However, unlike pollutants from human activity, naturally-occuring pollutants tend to remain in the atmosphere for a short time and do not lead to permanent atmospheric change.

Air pollution began to increase in the beginning of the twentieth century with the development of transportation systems and large-scale use of petrol and diesel. These severe air quality problems due to the formation of petrochemical smog from the combustion residues of diesel and petrol engines were felt for the first time in Los Angeles. Pollution due to auto- exhaust remains a serious environmental issue in many developed and developing countries, including, India.

The air pollution control act in India was passed in 1981 and the motor vehicle act for controlling air pollution was passed very recently. These laws are intended to prevent the air from becoming over polluted.