发布网友 发布时间:2023-09-15 19:18
共2个回答
热心网友 时间:2024-08-30 23:25
Long ago, the world's environment is very good, there are many trees. They can release oxygen and carbon dioxide inhalation. But since humans appeared, the number of trees are dwindling. Because people's living needs a lot of wood, so they cut down trees ceaselessly. Time for a long time, many forests have disappeared. Thus caused soil erosion. The fertile land into the desert. Many countries of the world have water crisis of difficulty. And the cities are often sandstorms hit. The life of people are a serious threat. While the other creatures and threatened.热心网友 时间:2024-08-30 23:26
Long, long ago, there are many trees in the world and the environment was very good. The trees release oxygen and absorb the carbon dioxide. But since the appearance of human being, the amount of trees was reced every day. Because our daily life needs a lot of trees, so we cut the trees every day. Many years later, many forests disappeared and then followed the water loss and soil erosion. The fertile soil became the desert. Many countries in the world face the crisis of water shortage now. And the cities always meet the sand storm. People’s lives are seriously threatened and so as many other animals.