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下面雅思頻道為大家整理了雅思寫作素材：城市擴張相關介紹，供考生們參考，以下是詳細內容。
It is Not Too Late to Stop It
It has been argued that urban sprawl is the root of many environmental problems. Today, I am offering my viewpoint on this issue and reasons to support my position. What is urban sprawl? Urban sprawl is defined as "the increased use of urbanized land by fewer people than in the past" (CWAC, n.d.). In the past, cities were compact and efficient but recently the density of land utilized per person has seen a major decline in the United States. From 1982-1997, the United States population had grown by about 17 percent, while the urbanized land had increased by about 47 percent during the same period in time (CWAC, n.d.). Developed land per person has just about doubled in the last two decades and the sizes of housing lots larger than ten acres can account for over half of the land that was developed since 1994 (CWAC, n.d.). This drastic change in urbanized areas has been met by both environmental impacts, as well as financial and time burdens on the people.
One of the most affected environments would be America's farmlands. Farmlands are being lost due to the creation of new highways, fringe industrial parks, and new sprawled housing developments (CWAC, n.d.). The loss of farmlands reduces our ability to produce food, fiber, and timber. Further, the higher tax rates and costs that are associated with urban sprawl are forcing many farmers to close down business and sell their farms to companies seeking to develop new housing areas, as a means to secure their financial security (CWAC, n.d.). This problem has highly affected the state of Wisconsin. In 1950, Wisconsin had roughly about 23.6 million acres of farmland and as of 2002 only had about 16 million acres. Along with this reduction in farmland area, the number of farms in Wisconsin decreased from 178,000 to 77,000 from 1910 to 2002 (CWAC, n.d.). This decrease in farmland is not only seen in Wisconsin but also the rest of the country. Between 1992 and 1997, the nation converted more than 13.7 million acres of farmland to urbanized areas (CWAC, n.d.).
Along with the loss of farmland, there is a loss of wildlife habitats that are disappearing due to urban sprawl. These forests, meadows, and wetlands are disappearing and being substituted with pavement, buildings, and sterile urban landscaping. This loss of wildlife habitats make it hard for species to survive and makes it difficult for them to find suitable breeding ponds, hibernation sites, feeding locations, and to create practical nesting areas (CWAC, n.d.). The urban sprawl has been so bad in some places that species of plants are becoming nearly extinct. For example, the Oak Savannas and the Oak and Pine Barrens both have been degraded to the point that there is less than 1 percent of the original species still around (CWAC, n.d.).
Urban sprawl has contributed greatly to air and water pollution as well as increased water and energy consumption. Since urban sprawl places people outside of walking distance to shopping areas and work areas, they are forced to rely heavily on cars to get from point A to point B. This over reliance on vehicles has contributed significantly to air pollution and greenhouse gases (CWAC, n.d.). Pollution from vehicles is usually the number one cause of pollution in many urbanized cities, such as Los Angeles. Another thing to think about would be the recent heat waves that have been experienced in the past month across the nation. People fail to realize that urban sprawl and pollution, which is a by-product of urban sprawl, have contributed significantly to the high temperatures this summer (Petix, M., 2006). Urban sprawl increases the amount of concrete and asphalt, thus holding in the heat and making it even warmer than it would have been had sprawl not occurred. Another part of this would be that the pollution leads to higher levels of humidity in the air and in turn exaggerates the effects of greenhouse gases (Petix, M., 2006).
