Junior high school science fiction composition 800 words

Scientists are going to let all the people on the earth emigrate, because the earth is too dirty to stay. Scientists started the space shuttles and spaceships of various countries, carrying more than 8 billion people and heading for the new earth at the fastest speed. At the destination, the new earth is exactly the same as the original clean and beautiful earth. In order to distinguish, humans named this new planet the celestial sphere, and they began to live and reproduce happily. However, less than a hundred years later, human beings treated the celestial sphere like the earth: killing precious protected animals and deforestation; Numerous pesticide plant, power plants and cement factories have been built ... These factories have discharged a lot of sewage and waste gas, and the ozone layer on the celestial sphere is becoming thinner and thinner. In addition, the frequent activities of sunspots have caused large-scale destruction of the ozone layer. Clear rivers become turbid, green forests become vast deserts, and glaciers in the Arctic melt faster. At least one low-lying country is flooded by sea every year. At this time, mankind woke up. Unfortunately, it is too late. No matter what means scientists use, it is of no help. It seems that the situation has reached an irreversible point. Some guys don't care, they think the celestial sphere is dirty, and it's a big deal to live on another planet. Sadly, however, there are only two earths in the whole universe, and not all planets are suitable for human survival. Fifty years later, the celestial sphere destroyed by human beings suddenly exploded, and human beings died.