The document discusses the greenhouse effect and global warming. It defines the greenhouse effect as an atmosphere containing gases that absorb and emit infrared radiation, trapping heat and warming the Earth's surface. It then explains the mechanisms by which sunlight and infrared energy are absorbed and reemitted by greenhouse gases like carbon dioxide, methane, and nitrous oxide. Increased concentrations of these gases from human activities are amplifying the greenhouse effect and causing global warming, with problems like rising sea levels and extreme weather. Solutions proposed to prevent further warming include transitioning to renewable energy sources, reforestation, and conserving energy.

1. Greenhouse effect

2. Objectives
After this lesson, students should be able to:
• Define the term greenhouse effect.
• Explain the mechanisms of greenhouse effect.
• Explain what are the effects of global warming on
Earth and its inhabitant.
• State and discuss the problems that would be
brought up by global warming.
• Discuss the solutions to prevent global warming.

3. INTRODUCTION

4. Introduction to Greenhouse effect
• What happens to a car that has been sitting in
the sun on a hot day with all its windows
rolled up?

6. WHAT IS “GREENHOUSE EFFECT”?

7. What is “Greenhouse effect”?
• The Greenhouse effect is caused by an
atmosphere containing gases that absorb
and emit infrared radiation.
– Greenhouse gases trap heat within the
surface-troposphere system, causing heating
at the surface of the Earth.

8. MECHANISMS OF GREENHOUSE EFFECT

9. Mechanisms of Greenhouse effect
Sunlight brings energy into
the climate system; most of
it is absorbed by the oceans
and land.
Heat (infrared energy) radiates
outward from the warmed
surface of the Earth.
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Some of the infrared energy is
absorbed by greenhouse gases
in the atmosphere, which re-
emit the energy in all
directions.
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THE GREENHOUSE EFFECT:

10. Mechanisms of Greenhouse effect
Some of the infrared
energy further warms the
Earth.
4
Some of the infrared
energy is emitted into
space.
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11. GLOBAL WARMING

12. Mechanisms of Amplified Greenhouse effect
Higher concentrations of
CO2 and other
"greenhouse" gases trap
more infrared energy in
the atmosphere than
occurs naturally. The
additional heat further
warms the atmosphere
and Earth’s surface.
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AMPLIFIED GREENHOUSE EFFECT:
Sunlight brings energy into the
climate system; most of it is
absorbed by the oceans and
land.
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13. Greenhouse gases
• Major greenhouse gases are:
– Water vapour
– Carbon dioxide
– Methane
– Nitrous oxide
– Ozone
– Chloroflurocarbon (CFC)

14. Causes of Global Warming
• These are the major causes of global
warming:
–Volcanic eruption
–Solar and orbital variations.
–Human activities (due to the increasing
human population)
• Burning of fossil fuel.
• Clearing of rainforest.

15. Problems caused by global warming
• Increase in global temperature.
• Melting of ice in Polar Regions.
• Rising of sea level.
• Increase in extreme weather events.
• Mass extinction of flora and fauna species.

18. Solutions to prevent global warming
• Use of Renewable energy.
– Wind
– Hydroelectric
– Waves
– Solar
– Thermal
• Use of Nuclear to generate energy.
• Reforestation.
• Conservation of energy.

19. SUMMARY
• Definition of “Greenhouse effect”.
• Simple description of the mechanisms.
• Increase in Greenhouse gases results in Global
Warming.
• Solutions to halt the increase in greenhouse
gases.