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 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 on earth.
Everyone loves his private home， whereas not everyone treasures our “public” home the earth. There would be no point in beautifying a private home if we no longer had a decent planet to put it on. Protecting the earth is protecting ourselves. Don't change our only homeland into our last graveyard。 East， West， “earth” is best， because it is Noah's ark for human beings.
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