Some people imagine to leave this fearful world, only to come down to earth. Scientists tell us that of all the stars known in the vast universe, the earth is the only planet on which human beings can survive. But now we are facing the risky problems concerning our existence on earth.
Worldwide environmental deterioration (恶化) is alarming. The earth is plagued with population explosion, energy crisis, lack of food, housing problem and environmental pollution. During the process of industrialization, human beings are pursuing crazily the benefits from the economic growth. Now we have suffered from the results. The overuse of natural resources has affected ecosystem(生态系统) on earth.
These seem to be some of the ways in which our common home is under destruction. The quality of our lives has enormously deteriorated in many aspects. Now our planet is experiencing survival tensions. Only when all of us make consistent efforts can we preserve the environment on earth, because there is no another earth in universe.
核心剖析 结尾回到文章开头阐明的中心思想或主题句上，使首尾遥相呼应。这样处理增强了语言表达力度，从而达到再次肯定和强调的效果。(注意：不要为结束而单纯地重复开始段的话。)
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