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| Q. |
The true statement about ‘green house effect’ is that it is |
| A. | caused by combination of many gases |
| B. | caused by CO2 |
| C. | caused only by CO2, CFC, CH4 and NO2 gases |
| D. | None of these |
| Answer» C. caused only by CO2, CFC, CH4 and NO2 gases | |
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