What were the main reasons behind the "Ganga Action Plan" which was initiated in $1985$? What values can be learnt from such plans?

(N/A) The aims of the "Ganga Action Plan" are:
$(i)$ To improve the quality of the river water.
$(ii)$ To check the growth of disease-causing microorganisms.
$(iii)$ To prevent the contamination of river water due to the discharge of industrial waste and sewage.
Values that can be learnt from the "Ganga Action Plan" are:
$(i)$ Conservation of water resources.
$(ii)$ Preservation of cultural and environmental heritage.
$(iii)$ Developing a sense of responsibility towards cleanliness and environmental hygiene.