The document discusses the greenhouse effect and global warming. It explains that the greenhouse effect is a natural process that helps keep the Earth warm, but that human activities like burning fossil fuels and deforestation have increased greenhouse gases to dangerous levels. This is causing global warming, which is raising temperatures and sea levels and causing more extreme weather. The impacts of global warming include worsening heat waves, floods, wildfires, melting glaciers and loss of biodiversity. Reducing fossil fuel use, planting trees, and transitioning to renewable energy are some ways to mitigate further global warming.

1. GLOBAL WARMING AND THE
GREEN HOUSE EFFECT
ALISHA KHAN
VII-G

2. The Greenhouse Effect
 Greenhouse : glasshouse designed
to trap the heat of the sun
 Uses: for production of fruits,
vegetables, and flowers in the
temperate countries
 Heated naturally by the incoming
rays of the sun and artificially by
using hot air and water.
 The system of trapping heat in an
enclosed area is known as the
greenhouse effect

3. Causes of Greenhouse
Effect
 Natural process
 Necessary for the survival of
living things as it keeps the earth
warm
 The amount of greenhouse gases
have increased dramatically over
the last thousand years

4. Causes of Green House Effect
 Burning of Fossil Fuels :
• The use of fossil fuels have resulted in the release of Carbon dioxide into the
atmosphere. This carbon dioxide heats up the earth’s surface and the oceans
• Every year, human activities are causing the release of about seven billion
tonnes of carbon dioxide into the atmosphere.
 Deforestation:
• Because of the felling old trees, or deforestation, less plants are available to
take-up carbon dioxide from the atmosphere. When the fallen trees and
plants slowly decompose, they release the stored carbon dioxide into the
atmosphere

5.  Population Explosion:
• With the increase in population, the demand for house, transport, and fuel
has increased. These demands increase the consumption of fossil fuels that
adds to the greenhouse effect.
 Farming:
• Farming provides food for the ever growing world population
• Fertilizers used in the farms contain nitrous oxide, a greenhouse gas into
atmosphere
• Therefore, farming is also responsible for creating greenhouse effect

6. Global Warming and Green House Effect
 Increase in the greenhouse gases through
burning of fossil fuels has disturbed the
ecological balance of the earth
 Since the Industrial Revolution, the temperature
of the earth is increasing
 Gradual increase in the earth’s average
temperature is referred to as global warming
 Primary source of the global warming is the
increase in the greenhouse gases

7. Various human activities that are responsible
for global warming are :
 Burning of fossil fuels for electricity generation and transportation
 Emission of smoke and harmful gases from factories
 Pollution caused in the upper atmosphere due to the flying of aeroplanes
 Deforestation of forests for agricultural and industrial purposes
 Forest fires

8. Impacts of global warming
 Heat waves
 Torrential rains and flooding
 Rise In the sea level
 Shrinking glaciers
 Disease outbreak
 Loss of biodiversity

9.  Heat Waves:
• Drought conditions and wildlife are associated with
increased heat waves
• The disastrous heat waves are the cause for the loss
lives throughout the world
 Torrential Rains and Flooding:
• The intensity of precipitation events has increased
the last few decades
• There are frequent floods and landslides

10.  Rise in the Sea Level :
• Rising sea level is one of the undeniable impacts of the global warming
• Sea levels around the world rose by an average of 10-20 cms during the
twentieth century
• This would further accelerate because of the melting of ice sheets on
Greenland and Antarctica
• Continued rising of sea will submerge the densely populated coastal regions
of the world
 Shrinking Glaciers:
• Glaciers are a source of fresh water in the world
• These glaciers are retreating because of the increase in temperature
• The shrinking of these glaciers will create a shortage of fresh water
• In Asia, the glaciers of the Himalaya are retreating at a record pace

11.  Disease Outbreak:
• The increased temperature accelerates the growth of disease causing
organism, especially mosquitoes.
• The warming of earth has been associated with the spread of tropical
disease like malaria, dengue fever, and yellow fever in the higher altitude
regions.
 Loss of Biodiversity:
• The increase in sea surface temperature has resulted in coral bleaching
• The melting ice in the Arctic is endangering the survival of polar bears

12. Mitigating Global Warming
 Global Warming may be brought under control by the following measures:
• Replacing coal and petroleum with the alternative source of energy
• Using energy efficient appliances and reducing the carbon footprint
• Use of recyclable and organic materials in the construction of buildings
• Controlling deforestation of rainforests all over the world
• Saving fuel consumption and the cost by use of the public transport
• Initiating afforestation and reforestation to plant more trees
• Practising reuse, reduce, and recycle

13. Thank you