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Throughout history, man has changed his physical environment to improve his way of life.With the tools of technology, man has altered many physical features of the earth.He has transformed woodland into farmland.He has modified the face of the earth by cutting through mountains to build roads and railways.However, these changes in the physical environment have not always had beneficial results.Today, pollution of the air and water is a danger to the health of the planet.Each day, thousands of tons of gases come out of vehicles.Smoke in factory polluted the air of industrialized areas and surrounding countryside.The air in cities is becoming increasingly unhealthy.The pollution of water is equally harmful.In the sea, pollution from oil is killing a lot of sea plants and fish.It is now neceary for man to limit the growth of technology in order to survive on earth.
