怎样写环保类文章

　Dear editor,

　Environmental problems are becoming more and more serious all over the world.

　Because of population expansion and overdevelopment, resources have

　become less and less.Trees on the hills have been cut down,and waste water is being poured continously into rivers.The whole ecological balance of the earth is changing.Massive destruction of environment has brought

　negative effects and even poses a great theat to man’s existence.

　 We must face the situation that exists and take action to solve our environmental problem.We hope that all these measures will be effective and

　bring back a healthy environment.

　 Yours truly,

　Lihua

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