Answers

2015-07-27T20:46:31+08:00
A gradual increase in the overall temperature of the earth's atmosphere generally attributed to the greenhouse effect caused by increase levels of carbon dioxide , chlorofluorocarbons and other pollutants
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2015-07-27T20:46:51+08:00
It is the abnormal change in the temperature of the Earth. It is caused by the greenhouse gasses and human activities such as deforestation. 
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