MCQOPTIONS
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				| 1. | 
                                    which among the following is the most abundant Green- House- Gas(GHG) in the earth’s atmosphere | 
                            
| A. | CO2 | 
| B. | Water vapor | 
| C. | SO2 | 
| D. | Trophospheric ozone | 
| Answer» C. SO2 | |