Please check this suggestion from Arghyam on building a
greywater management decision support system, with two parts: need assessment (like a risk score, estimated using various geospatial layers), and site suitability (based on parameters taken as input from the user as well as existing geospatial layers). Many of the required data layers for this are already available in the CoRE stack or can be brought in. And Arghyam can bring in the required technical expertise on how to string the layers together with primary data.
Also, I had shared about the protected areas database of news articles built by teams from IITB and Kalpvriksh:
https://pau-database.kalpavriksh.org/explore. They were able to provide polygon boundaries of almost 600 protected areas in India and we were able to combine them with
change layers of canopy density and tree height available on the CoRE stack (as part of Dhruvi and team's PhD research). Check out this GEE app
https://ee-aaditeshwar.projects.earthengine.app/view/protected-areas which now gives stats of change metrics along with up to 3 news articles about the area. This can extended much much further with other ecological sustainability metrics like fragmentation, water availability, land-use changes, plus interesting research that can be done by analysing the news articles text.