Hello everyone. Today, I will talk about air pollution because I thought about this problem before class. We live surrounded by the air every day and air are an essential part of life. However, air pollution is a problem in the world. In fact, it is us who are creating this problem. We are suffering from air pollution damages to our lives and health. And these are also the causes of global warming. Some things are necessary for us to live in good health in the future. It is important for us to reduce energy usage. For example, don't leave the lights on in the room or overuse the air conditioner. The world is becoming more and more easy to use, making life more convenient. However, don't forget that it causes air pollution. In addition, we should think about this topic and learn more using many books or Internet. Have you ever thought about air pollution?