What is greenhouse effect?</h2></div>

The term greenhouse effect was given by<span><br> </span></h2></div>

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How are the wild animals affected by cutting of forest?</h2></div>

Plume' refers to path of<span><br> </span></h2></div>

Crop production without using chemicals is called as</h2></div>

A movement similar to Chipko which has spread in South is<span><br> </span></h2></div>

How much percent of impurities are enough to make domestic sewage unfit for humans?