Water pollution is the last type. It is the contamination of water by sewage, toxic chemicals, metals, oils, or other substances. Like other pollution, it can kill. Five million people die every year from drinking polluted water. It affects rivers and lakes as well as oceans and ground water. Wastes disposed of into waters can kill all life in that area. Oil spills are the most destructive. Pesticides and other chemicals promote the growth of algae. Algae uses up all of the oxygen and life below it will die. Water pollution comes from businesses, farms, homes, industries, and other sources. It includes sewage, industrial chemicals, agricultural chemicals, and livestock wastes. Another form of water pollution is the clean but heated water discharged by power plants into waterways. This heated water, called thermal pollution, harms fish and aquatic plants by reducing the amount of oxygen in the water.
Over the years, pollution has gotten worse. Humans cause it and aren't really trying to make it better. Americans especially have misused our resources. The United States is an extremely industrial country. Americans have let the problem get out of hand. Business and factories cause most of the pollution. As we expand and grow, more of us are getting "lazy" and not caring about our world. This is increasing pollution.
To decrease pollution, we should make sure more people care. We should teach more about it and advertise recycling and conservation. If we couldn't get people to follow we could make laws and regulations. We could set up laws so that it is mandatory to recycle and limited use of motor vehicles. If we could get other countries to join, there could be a major difference in pollution.
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