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Many cities are struggling with urban runoff which often overwhelms water infrastructure during storms and prolonged periods of rain, causing flooding. Building more urban homes with green roofs is a win-win way of helping out when it is needed most... 
Depending on thickness, a sod roof can delay or 25-75% of runoff, and negate between 5-20mm of precipitation. With enough of these in a city it could be the difference between a heavy but endurable rain and flash flooding causing millions in damages.
Main thread on sod roofs in cities here:
Sod roofs are also more or less tornado proof, they help balance and stabilize a building in case of earthquakes, the material is free or very nearly free, carbon neutral, easy to build, provides good insulation and are very pretty.
