The pollution:

history and problems

The earth, changing  itself, has altered and goes on with
modifing its atmosphere.

In the primitive atmosphere the oxygen was not
present, but during the course of the times it
has grown up thanks to plants and
vegetables workkeeping  fit enough to
guarantee the life of all human beings.
For thousand millions of years everything
has been ruled by a wonderful balance
that has protected our air.
Nowadays the atmosphere composition is changing
at such a high speed that the scientists are not able to
foresee which effects could take place during
the next years.
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