As we all know the major problem of today's world is global warming . global warming is a phenomenon in which due to excess of green house gases the temperature of earth rises by three degree centigrade each year which will steadily  led to the melting of polar caps and flooding the areas nearer to coastal regions .
the main causes of global warming is the release of co2 &cfc .
it is also called the green house effect beacause the process is similar to green houses in which the house made of glass are used to the off season crops  &fruits. by raising the temperature of the house
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