As India is getting transformed and heavily industrialised,lot of trees are getting cut for new constructions.My Suggestion to counter this environmental imbalance would be to make it compulsory to create and maintain gardens on top of all these buildings and factories.This way we will make up for the trees cut in that area. It will take care of the pollution problem that most of the developed cities around the world are facing,There would be enough plants/trees to absorb the CO2 we produce.