環境四級寫作常見話題及范文
Like all other living beings, humans have clearly changed their environment, but they have done so generally on a grander scale than have other species. Some of these changessuch as the destruction of the worlds tropical rain forests to create grazing land for cattle or the drying up of almost three-quarters of the Aral Sea, once the worlds fourth-largest freshwater lake, for irrigation purposeshave led to altered climate patterns, which in turn have changed the distribution of species of animals and plants.
Scientists are working to understand the long-term consequences that human actions have on ecosystems, while environmentalistsprofessionals in various fields, as well as concerned citizens in the United States and other countriesare struggling to lessen the impact of human activity on the natural world.
Population Growth(人口增長)
Human population growth may be seen to be at the root of virtually all of the worlds environmental problems. Increasingly large numbers of people are being added to the world every year. As the number of people increases, more pollution is generated, more habitats are destroyed, and more natural resources are used up. Even if new technological advances were able to cut in half the environmental impact that each person had, as soon as the worlds population size doubled, the earth would be no better off than before.
The Population Division of the United Nations predicts that the 5.63 billion humans alive in
【環境四級寫作常見話題及】相關文章：
四級寫作經典范文10-09
常見作文寫作方法06-01
常見的寫作手法有哪些04-28
四級英語寫作方法09-17
常見應用文寫作格式11-12
公文寫作常見錯誤辨析范文10-11
四級寫作體育鍛煉范文10-09
四級暑期天天練：寫作范文10-09
寫作時間話題作文08-07
寫作手法常見有哪幾種11-16