Question

environmental aspects should be looked carefully before building huge dams why

Answer 1

When dams are built large areas surrounding the dam are submerged in water.this could lead to destruction of natural vegetation,agricultural land or even displace settlements. So one must check the surroundings before building a dam there..
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Answer 2

Explanation:

Building huge dams causes destabilisation of natural habitat of plants and animals living in the area these environmental aspects should be looked into before building dams