sample speech, global warming

1. A Speech
on
Global Warming: Causes and Measures to Control
Respected Ma’am and all my dear friends a very warm good afternoon to all. Today I
Shalini Pandey is going to deliver a speech on “Global Warming, it’s Causes and
Measures to Control”.
The term global warming refers to increase in average earth surface, air and
ocean. Another term most commonly used for global warming is climate change.
According to the report of Environment Protection Agency earth’s average
temperature has risen by 1.4 degree Fahrenheit over the past century. Over the past
few 100 years, human have been burning trees and fissile fuels, thereby releasing
millions of tons of carbon dioxide into the atmosphere. The increased level of carbon
dioxide in the atmosphere has caused the temperature of the Earth to rise. This, in
turn, causes more water to evaporate into the atmosphere. Water vapor is also very
good at absorbing heat. This causes the Earth’s atmosphere to become even warmer.
Scientist has called this effect ‘Global Warming’. They have warned that Global
Warming could shift rainfall patterns, raise the sea level and alter the ecological
balance.
Global warming is caused by many things. The causes can be divided into two
groups- man made or anthropogenic causes and natural causes. Natural causes are
causes created by nature itself. Our climate system response to change in external
forcing. Change in external forcing can push the climate either in the direction of
warming or cooling. Examples of external forcing include change in atmospheric
composition, solar luminosity, volcanic eruption and variation in earth surface
around the sun.
One natural cause of global warming is release of methane gas from Arctic
tundra and wetlands. Methane is greenhouse gas. A greenhouse gas traps heat in the
earth’s atmosphere, thus increase the earth temperature. Global Warming occurs as
a result of increased concentration of greenhouse gases in the atmosphere. The main
greenhouse gases are water vapor, carbon dioxide, methane, nitrous oxide and
ozone. These gases do now allow all the radiations from the Earth to escape back
into space. This is known as the Greenhouse Effect. This trapped radiation or
heat helps to keep the Earth at a constant temperature. Greenhouse effect is thus
very important to main the temperature of the Earth at a habitable level.
If we talk about man made causes, they do the most damage to the earth. The
main man made cause of global warming is excessive greenhouse gases emission

2. into earth near surface. Greenhouse gases include a no. of gases like carbon di oxide,
methane, nitrous oxide and CFC i.e. a chloro fluoro carbon; which is most
commonly used in refrigeration, cooling and manufacturing applications. The
largest man made contributor to the greenhouse effect is carbon dioxide emission,
about 77% of which is comes from combustion of fossil fuels and 22% of which is
attributed to deforestation. Thus deforestation is also culprit for causing green
house gas emission.
Another major man made cause of global warming is population growth.
More people means more food and more methods of transportation, it means more
methane because there will be more burning of fossil fuel. Thus we can say global
warming is a issue of serious health and environmental concern so we have think
about ways to control it. Global warming can be controlled by focusing on certain
practices like boosing energy efficiency, greening transportation, reviving up
renewable energy resources, phasing out fossil fuel, managing forest and
agriculture, exploring nuclear energy, developing and deploying low carbon or zero
carbon technologies and ensuring sustainable development. At personal level we
have to follow some eco friendly practices like more use of public transportation,
planting more and more trees, regular use of eco-friendly products.
At last I can conclude that global warming is the single biggest environmental
and humanitarian crisis of our time. The Earth's atmosphere is overloaded with
heat-trapping carbon dioxide, which threatens large-scale disruptions in climate
with disastrous consequences. We must act now to spur the adoption of cleaner
energy sources at home. Each individual have to be aware about environment
protection and should use healthy practices then only we will be able to save our
earth for future generation.
Thanks..