Collect the written materials of human destruction of the earth and talk about your feelings.

The earth is a small and lovely planet in the universe. The scope of human life is very small and resources are limited. If the earth is destroyed, mankind will have nowhere to go, thus reminding people to protect the earth carefully. I remember once, my father and I were walking by the river in my hometown, and an unpleasant smell came to my nose. I looked under the bridge: the dirty river was full of oil, weeds, peels and leaves, and there were piles of waste residue and garbage on the shore. That scene is disgusting! Seeing such a scene, I couldn't help asking my father, "Was the river like this before?" "In the past, this river was not like this. At that time, the river was crystal clear and fish and shrimp swarmed. On the banks of the river, willows and weeping willows, green grass and flowers are in full bloom. " Dad sighed while answering me. Ah! How desirable that is! But why, why are today's rivers daunting? In order to find this answer, I made a survey. In the 1980s, many factories were built in the upper reaches of this river. These factories only pay attention to improving economic benefits, ignoring environmental protection, and a large amount of wastewater is continuously discharged into rivers. Over time, the crystal clear river became turbid and the flowers withered. According to the description of the astronauts who were lucky enough to fly into space, the earth they saw in space was a beautiful, crystal-clear and only living planet, surrounded by a thin layer of water-blue tulle. The earth has always made selfless contributions to human beings, but because human beings don't know how to cherish, develop unrestrained and destroy at will, not only the natural resources of the earth are getting less and less, but also a series of ecological disasters have caused a threat to human survival. For example, in July 1995, an incident occurred in our country: several factories discharged excessive sewage and smoke into the ocean and atmosphere, which led to a large amount of acid rain decline and destroyed a large area of forests and crops. This not only pollutes the environment, but also causes serious losses to natural resources. Our earth is both lovely and fragile. Students, scientists have already proved that there is no second planet suitable for human habitation within 40 trillion kilometers of the universe centered on the earth. Humans can't expect to move to other planets after destroying the earth. There is only one earth, citizens of the earth, wake up! Let's start with protecting every grass, tree, mountain and water around us and take action. Let's protect the earth, our home! Here, I call on everyone to have a warm and clean home. In order to better benefit our future generations, please start from yourself: tighten every faucet around you, pick up every fruit peel on the roadside, pick up every plastic bag in the lake, actively publicize environmental protection knowledge, and strive to be loyal environmental protection guards.