2. Air pollution
Air Pollution is the human introduction into the
atmosphere of chemicals, particulates, or biological
materials that cause harm or discomfort to humans
or other living organisms, or damage the
environment.[1] Air pollution causes deaths[2] and
respiratory disease.[3] Air pollution is often
identified with major stationary sources, but the
greatest source of emissions is actually mobile
sources, mainly automobiles.[4] Gases such as
carbon dioxide, which contribute to global warming,
have recently gained recognition as pollutants by
climate scientists, while they also recognize that
carbon dioxide is essential for plant life through
photosynthesis.
3.
4. Smog
Smog is a kind of air pollution; the word
"smog" is a portmanteau of smoke and fog.
Classic smog results from large amounts of
coal burning in an area and is caused by a
mixture of smoke and sulfur dioxide.
5.
6.
7. Acid rain
Acid rain can damage non-replaceable
buildings, statues, and sculptures that are
part of our nation’s memories that we want
to last for a very long time.
A very serious problem is the effect of acid
rain on trees.
12. The Ozone Hole
• For nearly a billion years, ozone molecules in the
•
atmosphere have protected life on Earth from the effects of
ultraviolet rays.
In the past 60 years human activity has contributed to the
deterioration of the ozone layer. Scientists have discovered
holes in the ozone layer, caused by substances called CFCs
(chlorofluorocarbons).
13. • CFCs are used in refrigerators, aerosol cans and in the
•
manufacture of some plastic products.
In a year air travel releases 600 million tons of carbon
dioxide into the atmosphere. By the year 2050, increased
flights by jet airplanes will impact global climate through
the greater number of contrails they will produce.
The Antarctic ozone hole
14. • CFCs are used in refrigerators, aerosol cans and in the
•
manufacture of some plastic products.
In a year air travel releases 600 million tons of carbon
dioxide into the atmosphere. By the year 2050, increased
flights by jet airplanes will impact global climate through
the greater number of contrails they will produce.
The Antarctic ozone hole
![Air pollution
Air Pollution is the human introduction into the
atmosphere of chemicals, particulates, or biological
materials that cause harm or discomfort to humans
or other living organisms, or damage the
environment.[1] Air pollution causes deaths[2] and
respiratory disease.[3] Air pollution is often
identified with major stationary sources, but the
greatest source of emissions is actually mobile
sources, mainly automobiles.[4] Gases such as
carbon dioxide, which contribute to global warming,
have recently gained recognition as pollutants by
climate scientists, while they also recognize that
carbon dioxide is essential for plant life through
photosynthesis.](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)