Ngo's have banned the construction of dams because NGOs  are non governmental organizations that works on to protect our environment and surroundings. They also helps poor wagers . As building needs a lot of free space and not only building it but making big resovier before the dams can drown upto 5-10 villages that can also make villagers poor and loss of their land. As our government does not give the right amount to the villagers after taking their lands  houses, and farming lands on which villagers are depend upon. Not only this, due to building dams on river which comes or go from or to other state creates problem that is hard to solve. but  building dams are not only disadvantageous it also give advantage as it produces hydroelectricity that is very useful to this generation. 
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