In one sense, our planet is becoming hotter and more crowded, which leads to an increase in the accessibility of natural resources; however, on the other hand, industries are seriously polluting the air. Recent studies have shown that nine out of ten people breathe wind that is polluted, which causes serious health problems such as lung cancer and heart disease. Most urban residents are affected by air pollution more than those who live in rural places. According to my understanding, there are certain causes of this problem, and specific measures can be taken to resolve it.