现在的地球，眼看已被糟蹋的不成样了，人们开山毁林，开窖烧砖，危害了千万物种的生命。城市上空不是沙粒满天，就是大雾一片，人们呼吸道不是感染，就是发炎，人们总是得一些莫名其妙的怪毛病，却怎么也好不了，最后只有在绝望中逝去。难道这些不是人类自己造成的吗？农业污染，工厂污染、生活污染、无处不在。因为有了这些现象，我们人类也受到了应有的惩罚；酸雨、地震、海啸…

　　虽然环境被破坏了，但是，人们也渐渐开始觉悟了，亡羊补牢，也为时不晚。

　　人们不再大量砍伐树木，改为多栽树、种草、栽花。大家把热力发电厂改为水利发电厂。人们主动提起塑料袋，拿上了大夹子，成群结队的主动去保护环境。渐渐的，沙粒少了，大雾也少了，阳光也出来了，大地终于又充满了生机。

　　人们纷纷走出门，在阳光的沐浴中，脸上露出了笑容。鸟儿回来了，那婉转的歌声，那清脆的曲子从树上传了出来。四季终于有了规律，自然灾害也少了，环境变好了。

　　人们不用受到温室效应的煎熬，天空恢复了往日的湛蓝，河流重获了往日的清澈见底，鱼儿在水中自由来去，空气又变得清晰甜润了。

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作文地带知识拓展:

• 变化[biàn huà]的释义：意思为事物被另外的事物取代，事物状态或形式的转换或差别，即事物从一种状态转变为另一种状态。变化指事物状态或形式的转换或差别,即事物从一种状态转变为另一种状态。近义词为变动。出自《易·乾》：“乾道变化，各正性命。”换模型讲：变化是事物性质的体现。

  1.名词事物在形态上或本质上产生的新状况。

  2.动词事物产生了新的状况。

  变化英文详细解释(English Detailed Explanation)：

  Change 英[tʃeɪndʒ] 美[tʃeɪndʒ]：

  the act of becoming different, or the result of something becoming different

  改变；改动；变化；变动

  Let me know if there's any change in the situation.

  要是情况有了什么变化请告诉我。

  something that is pleasant or interesting because it is unusual or new

  （令人愉快或有趣的）改进，改变

  It's nice to see her smile for a change.

  看到她笑了，真好。

  money in the form of coins rather than notes

  硬币；辅币

  She gave me €5 in change.

  她给了我5欧元的硬币。

  to exchange one thing for another thing, especially of a similar type

  换，交换

  She's just changed jobs.

  她刚换了工作。

  to make or become different

  改变，变化

  I almost didn't recognize her - she'd changed so much.

  我几乎认不出她了——她变化太大了。

  to take something you have bought back to a shop and exchange it for something else

  （将购买的东西拿回店里去）换，交换

  I had to change those trousers I bought for (= take them back to the shop in order to get) a bigger pair.

  我不得不把买来的裤子拿回去换了条大些的。

  to form a new opinion or make a new decision about something that is different from your old one:

  If you change your mind about coming tonight, just give me a call.

  要是你改变主意今晚不来了，给我打个电话就行。

  to get off a train, bus, etc. and catch another in order to continue a journey

  换乘，转乘（火车、公共汽车等）

  I had to change (trains) twice to get there.

  到那里我得换乘两次（火车）。

  to put a vehicle into a different gear, usually in order to change the speed at which it is moving

  （车辆）换挡，变速

  UK Change down to go round the corner.

  转弯要换到低挡。

  smaller units of money given in exchange for larger units of the same amount

  （换开的）零钱

  Do you have change for a 20-dollar bill?

  你能换开20美元的钞票吗？

  to get or give money in exchange for money, either because you want it in smaller units, or because you want the same value in foreign money

  把…换成零钱;兑换

  Could you change a £10 note (for two fives), please?

  请问你能把一张10英镑换开（换成两张5英镑）吗？

  the money that is returned to someone who has paid for something that costs less than the amount that they gave

  找头，找给的零钱

  I think you've given me the wrong change.

  我想你找错我钱了。

  to remove one set of clothes and put a different set on yourself or a young child, especially a baby, or to remove dirty sheets from a bed and put clean ones on it

  （给…）换衣服;（给…）换床单

  You don't need to change - you look great as you are.

  你不用换衣服——这样看上去就很好。

  When the wind or the tide (= the rise and fall of the sea) changes, it starts to move in a different direction.

  （风或潮水）改向

  The tide is starting to change.

  潮水开始改向了。