Indore (sometimes also called mini Bombay) is the one of the worst hit area where people are leaving under the danger of depleting ground water levels. The only reason I think is less trees and no rain water harvesting (other then people do at home and that is again not with a good method) in the city.
Usually there has been many campaigns at different levels to spread awareness to people to plant tree but where is the space dude, this is town planning by our so called town planners. I have seen people leaving in very small houses, small streets, market space are not planned as well and its bizarre people tends to use street space too. I do not see if their is any space left to plant even a single tree.
Its a very chronic issue and cannot be solved overnight. Considering the damage that has been already done, it would be too difficult to even make this city greener ever.