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What is the reason for melting of polar caps?

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What is the reason for melting of polar caps?

(a) Increasing levels of sulfur

(b) Depletion of ozone

(c) Increasing levels of CO2

(d) Longitudinal radiation

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This interesting question is from Environmental Aspects of Power Generation in section Steam Generators & Accessories of Energy Engineering

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The correct answer is (c) Increasing levels of CO2

To elaborate: The growing levels of concentration of CO2 increase the surface temperature of earth. This may result in climatic changes with disastrous consequences, such as melting of polar ice caps and rising of sea levels.

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