This document discusses global warming and its causes. It defines global warming as the average increase in Earth's surface temperature due to the greenhouse effect. The main greenhouse gases that trap heat in the atmosphere are carbon dioxide, methane, nitrous oxide, and water vapor. The document lists human activities like burning fossil fuels, deforestation, and industrial activities as key contributors to increasing greenhouse gas levels and global warming. Effects of global warming include melting glaciers and sea level rise, increased extreme weather events, and disruption to ecosystems. Solutions proposed are transitioning to renewable energy, reducing fossil fuel consumption, and increasing carbon capture, recycling, and energy efficiency.

2. Name.
Mian Mehran Raza
Env. Sciences
Global Warming
University of Swat

3. What we are going to learn?
.Atmosphere
.GHG,s
.Green House Effect with example
.Causes of co2 and its sources (GHG)
.Global Warming
.Causes
.Effects
.Control/Solution

4. What is the atmosphere and why does it
trap heat?
The atmosphere is the air around the
surface of the earth. It is made from a
mixture of gases. We need it for
humans animals and plants to survive.
Some of the gases act like a blanket,
trapping heat. These gases are called
‘greenhouse gases’ and this
phenomena is known as the
‘Greenhouse Effect’. Without it, the
earth would be much colder.

5. Which gases in the atmosphere trap heat?
The atmosphere is made of 78% Nitrogen and 21% Oxygen.
But these gases don’t trap heat and cause global warming or
climate change.
What % of the atmosphere is left?
The gases which trap heat make up less
than 1% of the atmosphere! They are
called the ‘greenhouse gases’.
The main greenhouse gases are:
Carbon dioxide
Methane
Nitrous oxide
Water vapours
CFC’s
Human activity
increases the
amount of these
gases in the
atmosphere

6. DefinitionDefinition
The average increase in earth’sThe average increase in earth’s
surface temperature due tosurface temperature due to greengreen
house effecthouse effect is known as globalis known as global
warming.warming.

7. Example of the
Greenhouse Effect

8. Natural
Greenhouse effect
More heat is
trapped and
causes global
warming
Atmosphere
traps some heat
Some heat
goes out to
space
Some heat is trapped
and the earth is
warm enough for
life.
Enhanced
Greenhouse effect
Heat radiates
from the
earth
Heat radiates
from the
earth
Atmosphere
has more
greenhouse
gases
Atmosphere
traps more heat
Less
heat
goes out
to space

9. Causes of Global Warming

11. CO2
• Co2 is produced by burning of fossil fuels.
• More than 6 billion tons of co2 is produced
worldwide every year.
• By burning one gallon of gas 22 Million
molecules of Co2 are released to the
atmosphere.
• One molecule of co2 can stay 100 years in
atmosphere.

12. Industries

13.  Burning of fossil fuels
Increased coal,
natural gas
and petroleum
usage.

14. Vehicles

15. Deforestation

16. Forest Fire

19. Effects

20. • Glaciers and polar ice caps melts

21. Increase in Sea Level

23. Extra evaporation

24. Extra Precipitation

25. Rivers will burst their banks

26. Disturbs life on earth & in Oceans

27. Control

28. What we can do?
?

30. Control
• Using renewable sources of energy.
• Reduce our consumption of fossil fuels
• Capture Co2 at the place of production
• Reduce Deforestation & pay attention to
• Aforestation

31. •Reforestation
•Reducing, Recycling, Re-using
•Use of bicycle instead of vehicles
•Using public transport instead of
private automobiles.

32. One fourth of Co2 emissions can be
reduced by using properly our home
appliances.
Replace your old refrigerators with new
ones.
Introducing Energy Savers
Turning off lights, TV etc.