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

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

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

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

 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

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

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

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

 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

 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

 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

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

Thank you