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Global Warming
“The Greatest Threat”

Presented By:-

“Awanish Shukla”
Introduction
Is the world getting warmer?
If so, are the actions of mankind to blame for

earth’s temperature increases?...
History of Earth’s Climate
Earth formed ~4.6 billion years ago
Originally very hot
Sun’s energy output only 70% of pres...
History of Earth’s Climate
Life appeared ~3.8 billion years ago
Photosynthesis began 3.5-2.5 billion years

ago
Produce...
Earth’s Temperature
Solar
Sun

Energy
Solar
Energy
Earth’s Temperature
Sun

Solar
Energy

Radiation
Cooling
Earth’s Temperature
Sun

Solar

Energy

Radiation
Cooling
Earth’s Temperature
Sun

Solar
Energy

Radiation
Cooling
What is Global Warming?
•An increase in the earth's average atmospheric
 temperature that causes corresponding changes in ...
Sun

MAIN CAUSE
Greenhouse Effect
Earth’s Atmospheric Gases
Nitrogen (N2)
Oxygen (O2)

NonGreenhouse
Gases
99%

Water (H2O)
Carbon Dioxide (CO2)
Methane (CH...
Households are Big Contributors to Climate Change

Of all greenhouse gas
emissions come from
households:
• Vehicles
• Home...
Our reliance on cars that burn fossil fuels is
one of the major causes of increased levels
of carbon dioxide in the atmosp...
Facts about Global Warming

The world emits about 25.6 billion metric tons of
greenhouse gases annually.
These greenhous...
Carbon (109 metric tons)

8

Worldwide Carbon Emissions

7
6
5

Total
Liquid fuel
Solid fuel
Gas fuel

4
3
2
1
0
1750

180...
Global Warming’s Impact on
•HEALTH
•VEGETATION
• WEATHER
•LANDSCAPE
•POPULATION
Future Carbon Dioxide Levels
 Increasing CO2 emissions, especially in China and

developing countries
 Likely to double ...
So how can each of us
slow global warming now?
Reduce our consumption of fossil fuels
•Because greenhouse gas emissions are tied very closely to

our energy consumption,...
We can make some simple substitutions
•Replacing just 1 incandescent light bulb with 1
compact florescent bulb saves about...
Small changes really add up
Drive JUST 10 fewer miles
per week
Annual savings:
520 pounds CO2

Replace your old
refrigerat...
Easy Solutions
Turning off lights saves

energy and money.

 The more energy used,

the more rivers are
dammed or more f...
 Making paper and plastic bags

uses energy and resources.
 The bags add to our litter and

waste problems, and plastic ...
Our take-home message…

Each of us must take steps to protect our
Earth's climate.
Global warming
Global warming
Global warming
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Global warming

  1. 1. Global Warming “The Greatest Threat” Presented By:- “Awanish Shukla”
  2. 2. Introduction Is the world getting warmer? If so, are the actions of mankind to blame for earth’s temperature increases? What can/should be done about these issues?
  3. 3. History of Earth’s Climate Earth formed ~4.6 billion years ago Originally very hot Sun’s energy output only 70% of present Liquid water present ~4.3 billion years
  4. 4. History of Earth’s Climate Life appeared ~3.8 billion years ago Photosynthesis began 3.5-2.5 billion years ago Produced oxygen and removed carbon dioxide and methane (greenhouse gases) Earth went through periods of cooling (“Snowball Earth”) and warming Earth began cycles of glacial and interglacial periods ~3 million years ago
  5. 5. Earth’s Temperature Solar Sun Energy Solar Energy
  6. 6. Earth’s Temperature Sun Solar Energy Radiation Cooling
  7. 7. Earth’s Temperature Sun Solar Energy Radiation Cooling
  8. 8. Earth’s Temperature Sun Solar Energy Radiation Cooling
  9. 9. What is Global Warming? •An increase in the earth's average atmospheric  temperature that causes corresponding changes in   climate and that may result from the greenhouse effect •Since the last century, Earth's mean surface temperature  increased by 0.8 °C.
  10. 10. Sun MAIN CAUSE Greenhouse Effect
  11. 11. Earth’s Atmospheric Gases Nitrogen (N2) Oxygen (O2) NonGreenhouse Gases 99% Water (H2O) Carbon Dioxide (CO2) Methane (CH4) Greenhouse Gases 1%
  12. 12. Households are Big Contributors to Climate Change Of all greenhouse gas emissions come from households: • Vehicles • Home Heating • Electricity
  13. 13. Our reliance on cars that burn fossil fuels is one of the major causes of increased levels of carbon dioxide in the atmosphere and it is the primary cause of urban smog.
  14. 14. Facts about Global Warming The world emits about 25.6 billion metric tons of greenhouse gases annually. These greenhouse gases last a long time. The amount of oxygen dissolved in the oceans may decline. Warming begets more warming.
  15. 15. Carbon (109 metric tons) 8 Worldwide Carbon Emissions 7 6 5 Total Liquid fuel Solid fuel Gas fuel 4 3 2 1 0 1750 1800 1850 1900 Year 1950 2000
  16. 16. Global Warming’s Impact on •HEALTH •VEGETATION • WEATHER •LANDSCAPE •POPULATION
  17. 17. Future Carbon Dioxide Levels  Increasing CO2 emissions, especially in China and developing countries  Likely to double within 150 years: Increased coal usage Increased natural gas usage Decreased petroleum usage (increased cost and decreasing supply)
  18. 18. So how can each of us slow global warming now?
  19. 19. Reduce our consumption of fossil fuels •Because greenhouse gas emissions are tied very closely to our energy consumption, using less fossil fuel based energy puts fewer greenhouse gases into the atmosphere. This will help slow global warming. •50% of electricity in the United States is produced from coal. (
  20. 20. We can make some simple substitutions •Replacing just 1 incandescent light bulb with 1 compact florescent bulb saves about 150 pounds of carbon dioxide per year! •If every household replaced just 5 high-use incandescent bulbs with compact florescent lights we'd collectively save more than $8 billion each year in energy costs and we would prevent the greenhouse gases equivalent to the emissions from nearly 10 million cars. Source: http://www.energystar.gov
  21. 21. Small changes really add up Drive JUST 10 fewer miles per week Annual savings: 520 pounds CO2 Replace your old refrigerator with a new Energy Star: Annual savings: 700 pounds CO2 Wash clothes in cold water only Annual savings: 500 pounds CO2 Reduce your garbage by 10% through greater recycling or reduced packaging Annual savings: 1200 pounds CO2 Caulk and weather-strip around doors and windows Annual savings: 650 pounds CO2 These are mid-range estimates from published sources; your savings may vary. *
  22. 22. Easy Solutions Turning off lights saves energy and money.  The more energy used, the more rivers are dammed or more fossil fuel is burned, causing air pollution and increased levels of carbon dioxide in the atmosphere.
  23. 23.  Making paper and plastic bags uses energy and resources.  The bags add to our litter and waste problems, and plastic is not biodegradable.  Recycling is not the best answer because collecting and recycling materials requires energy.  Instead, carry a reusable cloth bag or a knapsack with you.
  24. 24. Our take-home message… Each of us must take steps to protect our Earth's climate.

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