Pollution is the introduction of harmful materials into the environment. Also, pollution is the process of making land, air, and water dirty and not safe to use. Worldwide, over 200 million people are affected by toxic pollution. In some of the world most pollutred places, babies are born with birth defects and have a life expectancy of 45. There are fve major types of pollution. These types include air pollution, water pollution, soil pollution, light pollution, and noise pollution.