下面雅思频道为大家整理了雅思写作素材：城市扩张相关介绍，供考生们参考，以下是详细内容。

　　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).

　　The effect that urban sprawl has had on people in general would be the fact that taxes are increasingly higher. Urban sprawl can cause increased traffic making work commutes longer and using more gas and creating more pollution (Tox Town, n.d.). There are higher costs for services such as refuse pickup and water supplies. The air quality can diminish and become toxic to people. For example, in my state of Washington, we periodically experience times where the air quality is poor and people who are on oxygen or have other health related problems are advised to not be outside. This is a problem caused by urban sprawl.

　　I believe urban sprawl has caused multitudes of environmental problems. Since people are using more resources than they need, they are undermining the efforts to create sustainability. Further, the pollution that comes with urban sprawl is having effects which support the issue of global warming. I believe something needs to be done to promote smart growth and sustainability. For instance, using subways and buses or living close enough to work to walk will help dramatically. If we take a proactive approach to this problem, over time we may be able to live in an environmentally stable world.

　　以上就是雅思频道为大家整理的雅思写作素材：城市扩张相关介绍，非常实用。更多资讯、资料尽在新东方网雅思频道。最后，新东方网雅思频道预祝大家在雅思考试中取得好成绩！