Humans impacting nature... dams in the Teesta river basin

There is no doubt in my mind that dams are an unpleasant necessity - they are the cleanest way of providing energy to a power hungry nation.
Nevertheless, this does little to allay a nagging fear about  the wisdom of constructing so many dams in a Seismic Zone IV area which is also the most landslide prone (GSI) in the country. One certainly hopes that Environment Impact Assessments were not glossed over in order to push these projects thru.
Placed above is a map (source) showing the many dams under construction or completed in the Teesta river basin.

Praful Rao