Pollution which is one of the biggest problems facing the world today has many effects on human life. First of all, pollution is bad for people's health. For example, smog, caused by car's exhaust fumes and factory emissions, can lead to lung diseases in humans. Also, food and water can be polluted by poisonous chemicals, and this can cause cancer in the people who consume them. Another effect of pollution is the destruction of human habitat. Thus, an oil spill can make an area where people previously lived uninhabitable.