Global Warming And Green house Effect

2. Presented By:
Umer Farooq Bsce01163048
Sohail Hussain Bsce01163047
Muhammad Rashid Bsce01163049
Ishaq
4/2/18

3. Greenhouse
Effect
And
GLOBAL
WARMING

4. Greenhouse Effect
The greenhouse effect occurs when
• Gases entraps infrared radiations.
• Then Planet becomes warmer.
• And Greenhouse becomes warmer.
• The greenhouse effect is caused by greenhouse
gases. The Earth is surrounded by a thin layer of
gasses.

5. Greenhouse Gases
The atmosphere has a natural
supply of greenhouse gases.
• Water vapor
• Methane
• Carbon dioxide
• Nitrous oxide

6. They capture heat and keep Earth warm enough for
us to live on.

8. How much solar radiation
reaches Earth?
The Earth’s
surface only
absorbs 51%
of incoming
solar
radiation

10. Greenhouse effect
Without the

11. The planet would be an
FrozenUninhabitable, Wasteland

12. Over the past 300 years, people started
emitting large amounts of greenhouse gases

13. What causes an increase
in Greenhouse gases?
• CARBON DIOXIDE is added to the atmosphere when people
burn coal, oil (gasoline), and natural gas FOSSIL FUELS, for
transportation, factories, and electricity.

14. What else causes an increase
in Greenhouse gases?
• Deforestation: or the clearing of forests, also
increases the amount of CARBON DIOXIDE
in the air.

15. What else causes an increase
in Greenhouse gases?
• Methane is produced when garbage is
buried in landfills, from animal waste
(poop), and from other natural sources.

16. What else causes an increase
in Greenhouse gases?
• As temperatures increase, evaporation
increases which adds water vapors in
the atmosphere.
• Evaporation; liquid turns into gas

17. The gases
can stay in
the
atmosphere
for at least
50 years
and up to
centuries.

18. The
result?

19. The
globe
has heated up by about one degree
Fahrenheit over the past century.

20. What is Global Warming?
• An increase in average global
temperatures
• It is caused by an increase in
Greenhouse Gases in the
Atmosphere

21. Is Global Warming Happening?
• 1. How much have global temperatures changed
between 1980 and 2000?
• 2. How much are global temperatures expected to
change between 2000 and 2100?

22. The difference in
global average
temperatures
between
modern times

23. and the last ice age

24. was only about
9 degrees Fahrenheit.

25. Is Global Warming Melting Ice Caps?

26. Glaciers are melting
• These are ice caps on both North and South poll. Pictured example:
Portage Glacier, Alaska
1914 2004

27. China
America is the #1 global
warming polluter in the
world.

28. D
i
s
a
p
p
e
a
r
I
n
g
Arctic ice
is
rapidly

29. Polar bears
and
indigenous
cultures are
already
suffering
from the
sea-ice loss.

30. Glaciers and mountain snows are
rapidly melting
Glaciers and mountains are
slowly melting.

31. Tropical Diseases
− Global Warming
increases drought
which lessens the
supply of clean
drinking water.
• Cholera
− It increases temperature
providing an ideal breeding
environment for
mosquitoes.
• Dengue fever
• Malaria
• Yellow fever

32. Coral reefs
which are highly sensitive to small changes in water temperature

33. Health & Global Warming
• High temperature can increase
pollution of water and air, which
harms the human body.

34. Suffered the worst bleaching-or die-off
in response to stress- ever recorded in
1998

35. Some Recent Climate Extreme Events in Pakistan
• 2009 Karachi received 205 mm of rain on 18
& 19 July. Heaviest rainfall earlier recorded at
Karachi was 207 mm on 1st July, 1977. The
normal rainfall at Karachi for the periods 1961-
1990 is 85.5 mm
• 2007 Record heat wave gripped Pakistan
during June, 2007. 48°C temperature was
recorded on 9th June at Lahore, a record
repeated after 78 years. Earlier it was
recorded on 8th June 1929

37. How To Prevent
Global Warming
 Plant trees
 Conserve energy:
(examples: 1. use low-energy,
low-water-use washing machines,
2. use a solar heated system for
hot water, 3. use an electric or
push mower for gasoline powered
mower)
 Buy energy efficient products
 Buy products that have reusable
or recyclable packaging
 Reduce use of car (walk instead)

38. We only have one beautiful
planet
Earth.

39. And we are all affected
And we are
all
being affected.

40. What
are
YOU
doing
A
B
O
U
T
It?

42. Reduce,
Reuse,
Recycle!
3R’s
of Saving Mother
Nature

45. 4/2/18