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.
   Indeed, much attention should be paid to these serious problems. The fate(命运) of the earth is held in our own hands. Countries must make complete schemes and perform them steadily. As individuals, all of us should realize how dangerous these problems are and do our best to keep our only home tidy and clean.
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。