Answers

2016-01-11T15:37:38+05:30
global warming is the melting of ozone layer because of certain chemical gases. deforestation is the cutting of trees without any reason. reforestation is the process in which trees are cut and new trees are grown.
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2016-01-17T15:27:02+05:30
Gradual increase in the overall temperature of the earth's atmosphere generally attributed to the greenhouse effect caused by increased levels of carbon dioxide, CFCs, and other pollutants.
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