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What causes green house effect?

(a) Carbon dioxide

(b) Carbon tetra oxide

(c) Oxygen

(d) Nitrogen

I have been asked this question in a job interview.

The above asked question is from Environmental Aspects of Power Generation topic in portion Steam Generators & Accessories of Energy Engineering

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The correct choice is (a) Carbon dioxide

Easy explanation: CO2 causes green house effect. The concentration of CO2 has increased to a level beyond the capacity of plant life and the oceans to completely remove it. 50% of CO2 added is retained in the atmosphere. And this retained CO2 causes green house effect.

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