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Which of the following is the major cause of global warming?

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Which of the following is the major cause of global warming?

(a) re-radiation of U.V. rays by CO2 and H2O.

(b) re-radiation of I.R. rays by CO2 and H2O.

(c) re-radiation of I.R. rays by O2 and N2.

(d) re-radiation of U.V. rays by O2 and N2.

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Correct answer: (b) re-radiation of I.R. rays by CO2 and H2O.

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