prepare a speech on 'Global warming-A deadly threat for human life
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As I understand, the Global Warming means the increase of the average temperature on Earth. As the Earth gets hotter, natural disasters like floods, earthquakes and hurricanes become more frequent. The measurements of temperature taken by instruments on land and sea have revealed that during the 20 century the Earth's surface and lower part of the atmosphere has warmed up by an average of 0.6 Centigrade. The summer which we are experiencing now is one of the hottest and I personally feel that it is the effect of Global Warming only. Thus, the situation is quite alarming and the "Global Warming" - the Deadly Threat for Human Life, is in front of us.
Greenhouse effect is a substantial factor in "Global Warming". What is this Greenhouse effect? When the heat and light from the sun is trapped in the atmosphere, the temperature rises and this is called the greenhouse effect. Green house gases emissions that are man made like nitrous oxide, carbon di oxide and methane, have increased because of deforestation and burning fossil fuels for transportation and energy uses.
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