请根据以下要点写一篇议论文，谈谈你对污染的看法（ 100~130 词）。
1. 当今污染已成为严重的社会问题。空气、河海、土壤的污染对动物和人类十分有害。
2. 列举 2~ 种污染的原因和现象及其后果。
3. 希望科学家们找出解决办法，恢复大自然的本来面貌。
拟用句型：
（ 1 ）主语 + mean sth. / to do sth./ doing sth. / that clause
（ 2 ）… not only … but also …
（ 3 ） do harm to sb. （sth.） / … harm to be done to sb. （sth.）
（ 4 ） have + 宾语 + 过去分词（表示一种遭遇或经历）
（ 5 ） It is said / reported … that clause
（ 6 ） look forward to sth. / doing sth.
拟用词组：
（ 1 ） send sth. into； （ 2 ）… die from /of； （ 3 ） because of； （ 4 ） prevent … from
［例题分析］
污染已成为人类所面临的严重社会问题，人类对于自己赖以生存的地球恣意掠夺、破坏，这已经给人们敲响了警钟。本文对于培养学生关心环境，热爱自己的家园具有积极、深远的意义。
本文要求考生根据提示和自己的背景知识谈谈对污染的看法，并针对污染这个中心论点，运用论据进行论证，属议论文。
［参考范文］
Today， pollution has become a serious problem to us. It means that the air， seas， rivers and land are polluted by waste or poisonous things. It does harm not only to human beings but also to animals （It does harm to animals， as well as human beings.）。
We cannot have fresh air because many factories have the poisonous smoke sent into the air. Beautiful parks are made dirty by plastic tins and bags. Fish die from the polluted water. It is said that strange diseases have appeared in some places because of pollution.
I hope scientists can find ways to solve the serious problem. We are looking forward to seeing the clear sky， clean rivers and beautiful parks again.
