Part 1 of Essay
As time advances pollution is every where, humans more and more rely on machines to live their lives. Machines like cars and trucks, airplanes, computer; all of which produce some kind of pollution. Maybe air, water, and even noise pollution are cause by these machines. Efforts to improve the standard of living for humans ....

Part 2 of Essay
.... introduce smoke and other, less visible, by-products into the atmosphere. Although wind and rain occasionally wash away the smoke given off by power plants and cars, the cumulative effect of air pollution poses a grave threat to humans and the environment. In many places smoke from factories and cars combines with naturally occurring fog to form smog. Smog has been long recognized as a potential cause of death, especially for elderly persons and those with severe respiratory ailments (like asthma). Air pollution ....