The human being are the main cause make the earth is heating up. People's the needs are increasingly improving, so factories are more and more built. Everyday, factories produce a lot of different products but people can't consume all of them so there have been a lot of garbage throw away. All of the garbage make the earth dirty. The smoke and wastewater are díscharged by the factories that caused air pollution, water pollution. In addition, Smoke car is also the cause make air be polluted. Transportation use fuel and oil which discharged into the atmosphere make the air be polluted sẻiously.Also, the earth is becoming more crowded due to the overpopulation
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