The air we breathe has seventeen different gases. It is made up mostly of nitrogen, not Oxygen. Recently, human activities have changed the balance in the Earth's atmosphere. Atmosphere is the air that surrounds the Earth. The wide spread burning of coal and oil increases the levels of carbon monoxide gas. Scientists believe this air pollution may cause Global warming. Certain chemicals used in the air conditioners, farming and manufacturing are the problem. They break down the ozone layer around the Earth. With less protection from the sun the air temperature rises and makes the Earth warmer. This leads to harmful effects on people, farming, animals and the natural environment.
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