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Q)

A natural phenomenon that becomes harmful due to pollution is _____________.

$\begin{array}{1 1} (a)\; \text{greenhouse effect} \\ (b)\; \text{ecological balance} \\ (c)\; \text{global warming} \\ (d)\; \text{desertification} \end{array}$

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A)
A natural phenomenon that becomes harmful due to pollution is greenhouse effect.The greenhouse effect is the process by which radiation from a planet's atmosphere warms the planet's surface to a temperature above what it would be without its atmosphere.Due to Pollution, Carbon dioxide (CO2) and other greenhouse gases act like a blanket, absorbing IR radiation and preventing it from escaping into outer space. The net effect is the gradual heating of Earth's atmosphere and surface, a process known as global warming.
 
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Global warming
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