تعبير
عن التلوث بالانجليزي قصير جدا
تعبير عن التلوث بالانجليزي قصير جدا
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Pollution
and greenhouse gases: two things
Fossil fuels
(oil, natural gas, coal) are the main source of air pollutants. They are also
the largest generators of greenhouse gases - mainly carbon dioxide (CO2) -
which contribute to global warming.
And smog?
Smog is a
yellowish haze from a mixture of air pollutants (fine particles and ozone) that
limits visibility in the atmosphere, as defined by the Quebec Ministry of
Sustainable Development, Environment and Parks17. In January and February 2005,
Montreal had the longest smog episode in its history: nine consecutive days18.
Greenhouse
gases, however, are not strictly speaking pollutants. Carbon dioxide is by no
means toxic in itself. It is even essential for the growth of plants, which
capture it and use its carbon to form their structure (carbon represents about
40% of the dry matter of plants15).
However,
burning large amounts of fossil fuels releases a lot of carbon dioxide -
trapped in the subsoil for thousands of years - and plants can no longer fix
it. The carbon dioxide is then found in excessive concentration in the air. It
can be considered a form of pollution, because it contributes to the greenhouse
effect that causes global warming.
It should be
noted that global warming tends to exacerbate the adverse health effects of
"true" air pollution16. It is this global warming that the Kyoto
Protocol tries to counter.
