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Question

Without green house effect, the average temperature of earth's surface would have been :

(a) 18C (b) 33C

(c) 0C (d) .15C

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Solution

At present, roughly 30% of the incoming solar radiation is reflected back to space by the clouds, aerosols, and the surface of Earth. Without naturally occurring greenhouse gases, Earth's average temperature would be near -18°C. Hence, the correct choice is (a).


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