2. Objectives
• What is the Global warming?
• Causes of the Global warming.
• Green house effect
• Advantages and disadvantages of greenhouse effect
• Threats due to global warming
• Solution of threats
• Conclusion
3. What is Global warming?
The earth heats up (the temperature rises)
4. What causes global warming?
One thing that causes global warming is electrical pollution.
Electricity causes pollution in many ways, some worse than
others.
In most cases, fossil fuels are burned to create electricity.
Fossil fuels are made of dead plants and animals.
5. Some common examples
Turning on a light
Watching T.V.
Listening to a stereo
Washing or drying clothes
Using a hair dryer
Riding in a car
Heating a meal in the microwave
Using an air conditioner
Playing a video game
Using a dish washer
6. Deforestation
the woods are lovely, dark and deep.
They’re our respite. Our places of peace. Our
natural air filters. Our water factories. Our
medicine cabinets. We literally can’t live without
them.
So why are they disappearing?
7. About half of the world's tropical forests have been
cleared, according to the United Nations' Food
and Agriculture Organization.(FAO)
Forests currently cover about 30 percent of the
world’s land mass (National Geographic)
Forest loss contributes between 12 percent and
17 percent of annual global greenhouse gas
emissions (World Resources Institute)
Deforestation
8. Climate change
When forests are cleared, they emit CO2 back into the
atmosphere and put humanity on a dangerous collision
course with the worst of climate change. And the problem
is enormous. Deforestation accounts for about 11% of
global greenhouse gas emissions caused by humans —
that's comparable to the emissions from all of the cars and
trucks on Earth combined. It gives us a safe, low-cost way
to remove carbon from the atmosphere while also
providing benefits to people.
9. • The heat and light can get through the atmosphere,
but it can’t get out. As a result, the temperature rises.
•Sometimes the temperature can change in a way that
helps us.
What is greenhouse effect?
• The greenhouse effect is when the temperature rises
because the sun’s heat and light is trapped in the earth’s
atmosphere.
11. Without it, the earth would be freezing, It would be
freezing at night because the sun would be down. We
would not get the sun’s heat and light to make the night
somewhat warm.
12. On the other hand it would be burning hot , During the
day, especially during the summer, it would be burning
because the sun would be up with no atmosphere to filter
it, so people, plants, and animals would be exposed to all
the light and heat.
13. Global warming is also causing many more fires that wipe out
whole forests. This happens because global warming can
make the earth very hot.
In forests, some plants and trees leaves can be so dry that they
catch on fire.
14. What is global warming doing to the
environment?
Makes the sea rise : the water covers many low land
islands, the plants and causes some of them to die so,
the animals lose a source of food, along with their habitat
, but people lose two sources of food, plant food and
animal food.
15. What is Acid Rain?
Acid rain is a mixture of wet and dry deposition (deposited
material) from the atmosphere containing higher than normal
amounts of nitric and sulfuric acids.
The precursors, or chemical forerunners, of acid rain
formation result from both natural sources, such as volcanoes
and decaying vegetation, and man-made sources, primarily
emissions of sulfur dioxide (SO2) and nitrogen oxides (NOx)
resulting from fossil fuel combustion.
17. Effect of acid rain
Taj Mahal color due to acid rain. Acid rain reacted with the
marble (calcium carbonate) of Taj Mahal. This caused
damage to this wonderful structure, ...
19. DNA damaged by UV light can cause skin cancer.
Infrared rays are harmful for life
20. Depletion of ozone layer
Chlorofluorocarbons (CFCs)
The most widely used ODS, accounting for over 80% of total stratospheric
ozone depletion.
Used as coolants in refrigerators, freezers and air conditioners in buildings
and cars manufactured before 1995.
Found in industrial solvents, dry-cleaning agents and hospital sterilants.
Also used in foam products — such as soft-foam padding (e.g. cushions and
mattresses) and rigid foam (e.g. home insulation).
Halons
Used in some fire extinguishers, in cases where materials and equipment
would be destroyed by water or other fire extinguisher chemicals. In B.C.,
halons cause greater damage to the ozone layer than do CFCs from
automobile air conditioners.
Methyl Chloroform
Used mainly in industry — for vapour degreasing, some aerosols, cold
cleaning, adhesives and chemical processing.
Carbon Tetrachloride
Used in solvents and some fire extinguishers.
Hydrofluorocarbons (HCFCs)
HCFCs have become major, “transitional” substitutes for CFCs. They are
much less harmful to stratospheric ozone than CFCs are. But HCFCs they
still cause some ozone destruction and are potent greenhouse gases.
In this section:
36. How we can minimize the Global
warming?
Small changes really add up
Replacing just 1 incandescent light bulb with 1 compact
florescent bulb saves about 150 pounds of
carbon dioxide per year!
37. Drive JUST 10 fewer
miles per week
Annual savings:
$80; 520 pounds
CO2
Wash clothes in cold
water only
Annual savings:
$70; 500
pounds CO2
Reduce your garbage
by 10% through
greater recycling or
reduced packaging
Annual savings:
1200 pounds CO2
Replace your old
refrigerator with a
new Energy Star:
Annual savings:
$90; 700
pounds CO2
Set your
thermostat down a
few degrees in the
winter
Annual savings:
$135; 1400
pounds CO2
38. Global warming awareness
Through seed distribution, agroforestory training, and our
country programs, we have empowered rural groups to
restore tree cover to their lands.
Planting trees protects the environment and helps to preserve
traditional livelihoods and cultures for generations.
