The document discusses the atmosphere and global warming. It outlines the key greenhouse gases like carbon dioxide, methane, and nitrous oxide that trap heat and are increasing due to human activities like burning fossil fuels. This greenhouse effect is causing global temperatures to rise and is affecting seasons, glaciers, sea levels, and plant and animal life. While natural factors influence the climate, human activities are the main driver of current global warming trends according to evidence like retreating glaciers and earlier seasonal changes. Individual actions like using energy efficient light bulbs and reducing packaging can help address the problem.

1. MIDDLE SCHOOL
by SUBASRI MAHARAJA

2. Hi
GUYS

3. PRESENTED BY
SUBASRI

5. POINT OUT THE FUNCTIONS OF ATMOSPHERE
 It is a protective sunscreen that
filters out most of the harmful UV
rays
 It is a store house of all natural gases
 It is a pipeline that moves dust, and
contaminants around the globe
 Keeping our planet at just right

6. Ozone layer in atmosphere

7. USES:
The ozone layer forms a thin
shield high up in the sky.
It protects life on Earth from
the sun's ultraviolet (UV)
rays.

8. EARTH’S ATMOSPHERIC GASES
Nitrogen (N2)
Oxygen (O2)
Water (H2O)
Carbon Dioxide (CO2)
Methane (CH4)
Non-
Greenhouse
Gases
99%
Greenhouse
Gases
1%

9. DEFINITION
• Greenhouse gases in the atmosphere like
water vapour, carbon dioxide, nitrous
oxide, methane and CFC trap the heat
that is reflected from the earth.
• When more of these gases are sent to the
atmosphere by human activities, the
atmosphere tends to trap more heat and
the earth is heated up.

10. GLOBAL WARMING
I
CAUSES
Greenhouse gases
&
Greenhouse effect

11. GLOBAL WARMING
CAUSES
GH GASES GH EFFECTS
 water vapour,
 carbon dioxide,
 methane,
 nitrous oxide, and
 Chloroflurocarban
(CFCs).
The greenhouse
effect is a natural
process that
warms the Earth’s
surface.

12. GREENHOUSE GAS
SOURCES
CO2 (CH4) CFCs N2O
2

13. CARBON DIOXIDE
 Most important green house gas
 Major contributor to global warming
 Plants and animals release carbon dioxide when
they breathe
 Carbon dioxide has increased due to
 Burning of fossil fuels such as coal, oil and natural
gases
 Global deforestation

14. HOW GLOBAL WARMING WORKS
Carbon Dioxide (CO2)
Fossil fuels (coal, oil, natural gas)
OZONE (O3)

15. DEFORESTATION

17. METHANE SOURCE

18. METHANE SOURCE: STOMACHS OF COWS AND
SHEEP

19. Methane
source:
Rice paddies

20. Coal seams and leaking gas pipes

21. NITROUS OXIDE
Chemical fertilizers
Burning fossil fuels

22. CFC
Air conditioning
Foams
Cleaning solvents

23. EFFECTS OF GLOBAL WARMING

24. EFFECTS OF GLOBAL WARMING
 Winters become shorter and warmer
 Summers become longer and hotter
 Farmers affected due to decline in water supply
 Polar ice caps and glaciers melt causing sea
level rise
 Animals and plants may have trouble adjusting
to major changes in climate

25. SEASONAL CHANGES
Winters shorter and
warmer
Summers longer and
hotter

26. WATER SUPPLY
Drought

27. SEA LEVELS
Sea level rise
Flooding,
Erosion

28. PLANT AND ANIMAL LIFE
Animals have trouble adjusting to major changes in
climate

29. WHAT’S THE PROOF THAT
GLOBAL WARMING IS TAKING
PLACE?

30. PORTAGE GLACIER
1914 2004 • Alaska
Photos: NOAA Photo Collection and Gary Braasch – WorldViewOfGlobalWarming.org

31. •Arizona COLORADO RIVER
June 2002 Dec 2003

37. INCANDESCENT LIGHT BULBS CFLs (compact fluorescent
lamps)

39. AVOID PRODUCTS WITH A LOT OF
PACKAGING

41. QUESTIONING
SESSION

42. GLOBAL WARMING IS CAUSED ONLY BY
NATURAL CAUSES.
SAY TRUE OR
FALSE

43. FALSE

44. WHICH COUNTRY EMITS THE
MOST GREEN HOUSE GASES?

45. CHINA

46. HOW LONG DOES IT TAKE FOR CO2 IN
THE ATMOSPHERE TO DISSIPATE?

47. 100 YEARS

48. WHAT IS A GREENHOUSE GAS THAT IS RELEASED
BY HUMAN ACTIVITIES AND SPEEDS UP GLOBAL
WARMING?

49. CARBON DIOXIDE

50. Our take-home message…
Each of us must take steps to protect our Earth's climate.