Environmental Engineering in CE
On prolonged exposure to high concentration of carbon monoxide (> 5000 ppm), man dies because

It forms CO₂ by combining with oxygen present in the blood
Of jamming of respiratory tract
Of clotting of blood
It forms carboxyhaemoglobin by combining with haemoglobin of blood, thereby making it incapable of absorbing oxygen

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Environmental Engineering in CE
Higher concentration of CO₂ in atmosphere

Reflects and absorbs the longer wavelength (infra-red) radiations
Prevents solar heat being radiated out completely, resulting in
All of these
Allows visible solar radiation (ultraviolet) of short wave-length to pass through

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