The Earth Is Our Only Home
   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.
   Much of the worsening situation could be changed if all sides make more effective efforts. Fortunately the solutions are in sight. Advanced science and technology will be introduced and applied. More laws on environmental protection will be drawn. We are sure to live in a better and cleaner world, and the earth will certainly remain our permanent (永久的) paradise (天堂).
核心剖析  表示对将来的展望或期待读者投入行动。此种结尾显示出文章发展的必然结果，因为提出问题、分析问题的目的不是为了展示问题，而是为了解决问题。这样结尾既帮助读者上升到理性的高度对问题有深刻、长远、明确的认识，又使读者得到启发，知道努力的方向，增强感受。