Global warming is caused by greenhouse gases like carbon dioxide and methane trapping heat in the atmosphere. This is called the greenhouse effect. While the greenhouse effect makes Earth habitable, the increasing levels of greenhouse gases from human activities like burning fossil fuels is causing the planet to warm dangerously. This global warming is raising sea levels, harming ocean life, increasing extreme weather, and destroying forests, threatening both the environment and human lives. Various efforts are being made to reduce emissions and mitigate global warming, such as using renewable energy instead of fossil fuels, driving less, and planting more trees to absorb carbon dioxide.

1. Global warming has become perhaps the
most complicated issue facing world
nowadays.

2. What is global warming?
The Planet Is Heating Up—and Fast

3.  The earth heats up (the temperature rises)=> It
happens when greenhouse gases (carbon dioxide,
water vapor, nitrous oxide, and methane) trap heat
and light from the sun in the earth’s atmosphere,
which increases the temperature. This hurts many
people, animals, and plants.

4. What is the greenhouse effect?
•The greenhouse effect is when the temperature rises
because the sun’s heat and light is trapped in the earth’s
atmosphere.
•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.

5. The greenhouse effect makes the earth
appropriate for people to liveon.

6. 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.

7. 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.

8. Carbon dioxide
Why is the amount of carbon dioxide in
the Earth’s atmosphere is increasing?
•
We are digging up carbon as:
Coal & Oil & Gas
•
We are burning them!
C + O2 →CO2

9. 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.

10. Global warming, is harming and killing algae in the
ocean.

11. One thing that causes global warming is electrical pollution, fossil
fuels are burned to create electricity. Fossil fuels are made of
dead plants and animals. Many pollutants are sent into the air
when fossil fuels are burned. Some of these chemicals are called
greenhouse gasses.
•The pollution that causes global warming is linked to acid rain.
=> Acid rain gradually destroys almost everything it touches

12. On an average by one family:
CO2 emissions
0.2 kg per mile
0.3 kg per
mile per
person
0.5 kg per
kWh
0.2 kg per
kWh
4000
miles per year
1000
miles per year
7300
kWh per year
17000
kWh per year
800 kg CO2/year
600 kg
CO2/year
3650 kg
CO2/year
3400 kg
CO2/year

13. Global CO2 Emissions
10.0
30 billion tonnes CO2
8 billion tonnes C
30
25
6.0
EVERY YEAR
20
15
4.0
10
2.0
5
0.0
1750
0
1800
1850
1900
Year
1950
2000
Billions of Tonnes of
Carbon Dioxide
Billions of Tonnes of
Carbon
8.0
35

14. Another thing that makes global warming worse is when
people cut down trees. Trees and other plants collect
carbon dioxide (CO2), which is a greenhouse
gas.(deforestration)
Global warming=> it is also destroying many huge
forests,many more fires that wipe out whole
forests. This happens because global warming can
make the earth very hot.

15.  Carbon dioxide is the air that our body lets out when we
breathe. With fewer trees, it is harder for people to
breathe because there is more CO2 in the air. Plants
collect the CO2 that we breathe out, and they give back
oxygen that we breathe in. With less trees and other
plants, such as algae, there is less air for us, and more
greenhouse gases are sent into the air.

16. What are people doing to stop
global warming?
 Carpooling=>is driving with someone to a place that
you are both going to. This minimizes the amount of
greenhouse gases put into the air by a car.
 Another thing that people are doing is being more
careful about leaving things turned on like the
television, computer, and the lights.

17. The Clean Air Act is making many companies change their products to decrease
these problems. Part of the law says that you may not put a certain amount of
pollutants in the air.
The Clean Air Act has also made car companies change some of the things
inside of the cars. Cars pollute a lot. While cars make more than half of the
world’s smog.
•Reducing cars, buses, and trucks which are also responsible for over 50% of
dangerous chemicals let into the air
•Ozone - Ozone is produced when other pollution chemicals combine. It is the basic
element of smog.
•It causes many different kinds of health issues dealing with the lungs.
• It can damage plants and limit sight. It can also cause a lot of property damage.

18. If we want to live longer,to be safer
and in good health we must protect
our environment

19. Despair?
You may never know what results
come of your action,but if you do
nothing,there will be no result.
Mahatma Gandhi

20. Presentation by,
 RAJAT KALSOTRA
 IX B
END