3. Global warming
Refers to any increase in average
global temperature, and in this
article refers to the unusually rapid
increase in Earth’s average surface
temperature over the past century
primarily due to the greenhouse
gases released by people burning
fossil fuels.
4. Consequences
Sea levels will rise, flooding coastal areas.
Heat waves will become more frequent and more
intense.
Droughts and wildfires will occur more often.
The disease-carrying mosquitoes will expand
their range. And it will push species to extinction.
5. Causes
Almost 100% of temperature increase observed
in the last 50 years has been due to
increased atmospheric concentrations of gases
such as steam, carbon dioxide (CO 2),
methane and ozone.
Greenhouse gases are gases that contribute to
the greenhouse effect. The largest
source contributor of greenhouse gases is the
burning of fossil fuels leading to the emission
of carbon dioxide.
6. The Greenhouse Effect
When sunlight reaches Earth's surface some is
absorbed and warms the earth and most of the
rest is radiated back to the atmosphere at a
longer wavelength than the sun light. Some of
these longer wavelengths are absorbed by
greenhouse gases in the atmosphere before
they are lost to space. The absorption of this
long wave radiant energy warms the
atmosphere.
7. Global warming causes by
greenhouse effect
Greenhouse gases in the atmosphere act like a
mirror and reflect back to the Earth a part of the
heat radiation, which would otherwise be lost to
space. The higher the concentration of green
house gases like carbon dioxide in the
atmosphere, the more heat energy is being
reflected back to the Earth. The emission of
carbon dioxide into the environment mainly
from burning of fossil fuels (oil, gas, petrol,
kerosene, etc.) has been increased
dramatically over the past 50 years, see graph
below.
8.
9. • USEFUL ADVICES
a)I think that we need to reduce the
use of fossil oil.
b)To plant trees.
c)Don’t drop litter or garbage.
d)Don’t drop poisonus sustances to
the rivers.
10. Conclusion
In my opinion, we should
recycle all the things we waste
and help to keep clean the city
in which we live.
Thanks for your attention!
Att: Nahomi Tumalie G.
