Boys and girls, do you understand how much environmental knowledge, know? Protecting the environment is the human consciously protect natural resources and make them get reasonable use, to prevent the pollution of natural environment and damage. Now, the earth environment gradually destroyed. Because there are many environmental destruction, someone for reason, there are natural causes. But most people are deforestation, litter and other factors.

　　As far as I know from the Internet, 30 years from 1950 to 1950, more than half of the world's forests have been destroyed, one half of the forest land into desert in Africa. Green vegetation is present in the human nature of "being" of life. World the 50 years after the 20th century, however, damage to people and animals live in green environment, green vegetation is in a recession, the global soil loss to increase to 25.4 billion tonnes a year, desertification, soil is at an annual rate of 5 to 7 square kilometers expanded rapidly.

　　In 1998, through China the earth in the Yangtze river, the songhua river, such as large rivers, lost the past gentle beautiful smiling face, out of ferocious ferocious terror. Raging storms, the roaring river, rolled up the flood peak, and again engulfed entire villages, pieces of land, cities and counties, each factory, a school... Oh my god, this is what a loss!

　　In recent years, because humans cut down trees, also damage the environment, make the vegetation destroyed, causing the phenomenon of land desertification, soil erosion, etc. Trees also gradually reduce, then, to absorb carbon dioxide, large amounts of carbon dioxide make the air become warm, creates the world present situation: the greenhouse effect.

　　Campus is always has a beautiful scenery, now everyone don't protect the environment, it makes our environment destruction. Look at the corner of the street is filled with plastic bags, cigarette butts. On the flower beds in the neighborhood is filled with dirt, we should protect everything we have good resources. I have people here don't protect environment under the condition of reverie: one day, the tree my grandfather in the beautiful scenery in a rest, suddenly to a few people, to prepare for a picnic here. Not for a moment here a beautiful environment becomes dirty, but this a few people or ignored. "The men finally walked" the tree grandpa sad cried, alas! The men got the cigarette butts on the grass, the ground filled with plastic bags, bottle. A few days later the tree grandpa dyspnea died because of bad environment.

　　同学们，环保知识你们了解多少，知道多少?保护环境是人类有意识地保护自然资源并使其得到合理的利用，防止自然环境受到污染和破坏。现在，地球上环境逐渐遭到破坏。环境遭破坏的原因有许多，有人为原因，也有自然原因。不过大多数是人们乱砍乱伐，乱扔垃圾等因素。

　　据我从网上了解，自1950年到1980年30年间，全世界有一半以上的森林面积被毁，其中非洲的二分之一林地变成不毛之地。绿色植被是大自然赠于人类的“生命之被”。可是，世界进入20世纪50年之后，人和动物赖以生存的绿色环境遭到破坏，绿色植被正在衰退，全球土壤失量现以增加到每年254亿吨，沙漠化土壤正以每年5-7万平方公里的速度迅速扩展。

　　1998年时，流经中国大地的长江、松花江等大江大河，失去了往日温柔美丽的笑脸，露出了凶猛恐怖的狰狞。肆虐的暴雨，咆哮的江水，卷起了一次次洪峰，吞噬了一个个村庄，一片片田地，一个个市县，一座座工厂，一所所学校……天哪，这是多么大的损失啊!

　　近几年，也因为人类大量砍伐树木、破坏环境，使植被遭到破坏，造成了土地沙漠化、水土流失等现象。树木也渐渐减少，于是，二氧化碳无法吸收，大量的二氧化碳使空气变得温暖，就造成了世界上目前出现的状况：温室效应。

　　园里都总有一处美丽的风景，可现在大家都不保护环境，这才使我们的环境遭受破坏。你看街道上的角落到处都有塑料袋，烟头。小区里的花坛上到处都有脏东西，我们应该保护好我们现在所拥有的一切美好资源。我就在这人们不保护环境的情况下遐想：一天，大树爷爷在一处美丽的风景休息，突然来了几个人，准备在这里野餐。没一会儿这里美丽的环境一下变得脏兮兮了，但这几个人还是置之不理。“这几个人终于走了”大树爷爷悲哀的叫着，唉!那几个人把小草上弄上了烟头，地上掉满塑料袋，瓶子。没过几天大树爷爷因环境不好呼吸困难死去了。