pollution and its impacts

Since the 17^th century, world’s achievements in science and technology have been significant. Science, is based upon the information that comes from five senses, has amazed the whole world with its advances, most of which were made in the last four or five decades of the 21^st century. The present world has become a global village because of communication advancements. Man has invented countless impressive machines and motor vehicles like cars, buses, trains and airplanes which have brought revolution in the field of transportation and communication. With the help of jet air crafts, one can travel around the world in a short time. However, one should not forget that these scientific inventions have made human life more threatening than ever. Vehicles use petrol, diesel and coal as fuel which are considered pollutants as they emit poisonous smoke. Things as simple as temperature, light and sound may also become dangerous pollutants when they are introduced artificially in to the environment. This poisonous smoke contains carbon dioxide and carbon monoxide. When these highly poisonous gases mix with the air, they pollute it which is called environmental pollution. There are several kinds of pollution, for example; air pollution, soil pollution, water pollution and noise pollution. We watch innumerable carriages, rickshaws, trucks, buses and cars plying on the roads. These are the main sources of air pollution. Besides, there are thousands of trains carrying passengers and their goods from one place to another. These trains mostly used coal or fuel. The smoke emitted by trains is highly poisonous. More than 60% air pollution is caused by vehicles and trains. The contaminated air is harmful to human beings because all living beings need fresh air to inhale. When they inhale polluted air, they fall victim to lung diseases. It is said that, globally, more than 3million people get killed by air pollution every year. There are millions of mills and factories which manufacture goods of different kinds. The chimneys of these mills and factories also release poisonous smoke. Moreover, these factories use many kinds of poisonous and harmful chemicals. A lot of kinds of waste matter produced by the mills and factories are drained out into stream and rivers. This contaminated water is dangerous for fish and other aquatic organisms. Thus, water pollution is mainly caused due to these factories and mills. Contaminated water causes several stomach diseases among living beings.