4. Did he become famous when he was 17?Passage 5:
Air pollution, as we know it today, started with the Industrial Revolution in Europe in the 19
thcentury. In
the last few decades, it has become the major problem for our environment.
Clean air is normally made up of nitrogen (76%), oxygen (22%), carbon dioxide and a few other gases.
When harmful elements get into the air, they may cause health problems and can damage the
environment, buildings and soil. They make the ozone layer thinner and thinner and lead to the warming
of the earth's atmosphere and climate changes.
Our modem lifestyle has led to dirtier air over the years. Factories, vehicles of all kinds, the growing
number of people are some things that are responsible for air pollution today. But not all pollution in the
air is caused by people. Forest fires, dust storms and volcano eruptions can lead to the pollution of the
atmosphere.
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