Pollution is the act of harming the ecosystem over a long period of time. One of the most important causes is the very high use of energy in the present day world. Pollution is found in air, water and land. Air pollution is the addition of toxic waste to the air in very large quantities that are harmful to human health and have side effects on animals and plants. The major source of air pollution is from the coal power plants. The burning of solid wastes and the very high rise in numbers of cars and trucks in the last few years are other major reasons. Water pollution is the letting into fresh or ocean waters chemicals or biological waste that spoils the quality of the water and affects the fishes and other animals living in it. This ranges from addition of sewage to the most toxic metals and chemicals. Land pollution is the damage of the land surface by acts like mining for coal and iron which causes soil to be lost for a very long time. Urban waste is becoming a very big problem for the cities in our country. Garbage is used as landfill and causes pollution of the soil. These wastes threaten the health of people in residential areas. Dumping of waste leads to rise in the number of pests like rats, which in turn spread diseases. A nation cannot grow if steps are not taken to stop pollution now. Progress will depend on unity in positive action by the world leaders. Earth is not owned by those living in the present. The world belongs to those who are yet to come in the future.