Answers

2015-09-11T20:30:33+05:30
A gradual increase i the overall temprature of the  earth's atmosphere genrally attributed to the greenhouse effect caused by increased levels of carbondioxide 
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2015-09-11T20:30:47+05:30
Global warming is the increase of Earth's average surface temperature due to effect of greenhouse gases, such as carbon dioxide emissions from burning fossil fuels or from deforestation, which trap heat that would otherwise escape from Earth.
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