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Global warming definitions :
- A gradual warming of the Earth's atmosphere reportedly caused by the burning of fossil fuels and industrial pollutants.(www.dairynet.com/kids/gloss.html)
- Global warming is the gradual increase in global temperatures caused by the emission of gases that trap the sun's heat in the Earth's atmosphere. Gases that contribute to global warming include carbon dioxide, methane, nitrous oxides, chlorofluorocarbons (CFCs), and halocarbons (the replacements for CFCs). The carbon dioxide emissions are primarily caused by the use of fossil fuels for energy. (www.airdfw.com/heating-glossary.htm)
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Global Warming, in brief, is the warming of the Earth. Our planet, Earth, is continually being warmed by different sources (for e.g. gases in the atmosphere, ultraviolet rays from the sun etc.) This total process of warming of the earth due to different reasons is called the Global Warming. But why do we need to be so cautious of it? The truth is that certain human activities are affecting this process in a negative way. Industries and modern factories release gases in a large amount which enter the atmosphere and stay there. They have the ability to absorb heat and also to send it back towards earth. In this way, the planet's overall temperature starts increasing. This in turn results in more diseases and more severe natural disasters thus causing thousands of deaths.
It is certainly one of THE biggest problems facing the scientists today (http://library.thinkquest.org/C006156/main.htm)