The vast majority of rooftops are just wasted space, especially in crowded cities. At the very least, they should be collecting rainwater or covered in solar panels. Larger urban buildings are more likely to make use of their rooftops by turning them into terraces, but why do we so rarely do the same for houses?
READ THE FULL ARTICLE: https://news.yahoo.com/stepped-rooftop-creates-space-urban-220031346.html
Original source: https://www.urbanorganicgardener.com/2019/12/vietnam/