As we all know, the Sahara desert is vast, extremely dry, hot and dry all year round, and there is very little precipitation. However, Sahara thousands of years ago was a verdant field dotted with lakes. Human society spread to the area. They reclaimed land for planting. Crops and animal husbandry have destroyed the Saharan ecosystem. Local farmers have deforested heavily in Sahara, cultivated grasslands, overgrazed and degraded the soil. Vegetation has gradually decreased, causing the temperature in the Sahara to gradually rise. As more farmers enter the Sahara In the region, more land is being reclaimed, which further leads to higher temperatures. Gradually, precipitation decreases and the high temperature and lack of water make the vegetation slowly disappear. In the end, there is almost no rainfall in the Sahara, and a large number of plants die, leaving only A few heats- and drought-resistant desert plants. The most accurate summary of the main points of this text is:. ['Human activity leads to desertification in the Sahara.', 'High temperatures and low precipitation are the main reasons for the formation of the Sahara Desert.', 'Reduced vegetation in the Sahara desert is caused by heavy logging by farmers.', 'Excessive deforestation and overgrazing by humans may turn the oasis into a desert.']