Mom, it's snowing outside. How beautiful! Hey, why is the snow so bright this year? "I lie prone at the window, pointing to the world outside the window, and said happily. Mother looked up at the window, her eyes a little nostalgic and sad. She knows that snow is colorful because it is polluted by various exhaust gases and toxic chemicals when it falls from the sky. Only snow is really beautiful. I looked at the door of my room, which was sealed before I was born. I have never left this room. Looking at the beautiful snow outside, I wanted to go out, but my mother wouldn't let me, so I had to give up.

Today, mom is not at home. I looked at the beautiful scenery outside and couldn't help going out. I pulled the door with my hand, but the sealed door did not move. "What should I do? What should I do? " Suddenly, I had a brainwave and thought: just break the window with a chair. "Path, what are you doing?" Mom just came back from the outside and saw that I was going to hit the window with a chair, so she quickly asked. But it's too late. I have smashed a big hole in the glass window, and the black gas poured in from the window, which made me cough. "Path, danger!" My mother jumped on me, hugged me from the window, rushed to the safety cover in the corner and quickly pressed the button of the safety cover. The red light at the base of the safety cover is on, and three transparent steel sheets that have just bloomed like lotus flowers are slowly closed, tightly wrapping us inside. Then, a small port spews white gas, which is life-saving oxygen. A few minutes later, three lifeguards saved us.

A week later, I returned to my home. "Path, do you really want to go out and have a look?" Mom asked. I nodded hard. Mother took out a small helmet and a silver sealed suit from the closet for me to put on, and then said, "Come with me." Mother opened the door that had never been opened in her memory.

When I went out with my mother happily, I was shocked: there was no green grass, no blue river, no happy birds ..., the sky was as turbid as thick ink, the air was full of pungent smell, the lake was covered with white foam and shiny oil, the ground was covered with scrap iron, all the buildings were sealed up, and the whole world was so quiet that no sound could be heard. However, my mother clearly told me that there are green grass, flowers, birds, blue sky and white clouds outside. "Don't, don't!" I was so scared that I cried loudly. "Path, what's the matter? Wake up. " I remembered the kind words my mother said in my ear. Oh, it was a dream!

Although I woke up from my dream, I still had a lingering fear. We have entered the door of the new century, but there is a huge roadblock lying across the door. This tiger is opening its maw and devouring us humans. This is environmental pollution, which is a century-long problem. If we don't wake up now and pay attention to protecting the environment where we live, maybe that day will really come.

If that day really comes, how will we face it?