Aptly said about the ban of plastic around reserves. Enforcing that would be a task but if administered properly by the Govt (which is highly unlikely most of the times), could bring out great results.
The thing about Indians having an instinct to spit and litter, I feel that's all about the way you look at it. I used to think that way initially but then when I studied and understood the impact littering and spitting had around me, I made efforts to curb it myself on a small scale by monitoring myself in order to not litter my surroundings. Soon, that became a habit and was followed by me wherever I went. Today, I don't litter, spit or urinate anywhere on the road or around forests