Which of the following statements are correct with regard to contri...

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Which of the following statements are correct with regard to contribution of various factors to greenhouse effect?
I. Relative contribution of various gases like \( \mathrm{CO}_{2}, \mathrm{CH}_{4}, \mathrm{CFCs}_{2}, \mathrm{~N}_{2} \mathrm{O} \), etc.
II. Biological magnification and eutrophication.
III. Deforestation to incorporate Urban needs.
IV. Various activities like burning of fossil fuels.
V. Odd climatic changes such as El-Nino effect.
- VI. Use of refrigerants like chlorofluorocarbons.
(a) II, IV, V and VI
(b) I, III and IV
(c) IV, V and VI
(d) II, III and I
W)
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