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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 info 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.
Over the past few 100 years, human have been burning trees and fissile fuels, thereby releasing millions of tones 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 cause 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.
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SPEECH ON GLOBAL WARMING.... Day by day, we are feeling great changes in the atmosphere and climate of the earth. The earth atmosphere is getting warm gradually however the process has become fast in last few years. The natural disasters we are facing now a day such as earthquakes, tsunami, cyclone, storm, thunder, etc are the result of global warming. We are feeling a huge change in the season’s length like winter season is getting short and summer season is getting long. Polar icecaps and glaciers are melting to a great extent. climate is changing, weather patterns are changing, environment temperature is increasing affecting whole climate adversely, and other problems because of the human industrial activities. Earth’s surface atmosphere is steadily increasing because of the primary causes of global warming such as green house effect of the green house gases. Green house gases collected in the atmosphere like carbon dioxide traps the dangerous UV rays and makes environment hotter. Because of the global warming drought and flood may occur more frequently. We should try to drive less and in very smart way for the fewer harmful gas emissions. We should try to walk by foot as much as possible instead of using bike, car or other means of transport. We should reduce our hot water use and try to use cold water as much as possible. In this way by reducing our electricity use we can reduce the global warming. Together with changing our own habits, we should encourage others to conserve energy by reducing lights use as much as possible.
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