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Higher concentration of CO2 in atmosphere

allows visible solar radiation (ultraviolet) of short wave-length to pass through.
reflects and absorbs the longer wavelength (infra-red) radiations.
prevents solar heat being radiated out completely, resulting in 'heat trap' i.e., global warming.
all (a), (b) and (c).

Correct Answer: all (a), (b) and (c).

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