Well... they MIGHT have something to teach the city planners of San Francisco:
Bangladesh stops open defecation in just over a decade · by grundle · 54 replies
Associated Press ^ | July 16, 2016
Through a dogged campaign to build toilets and educate Bangladeshis about the dangers of open defecation, the densely populated South Asian nation has managed to reduce the number of people who defecate in the open to just 1 percent of the 166 million population, according to the government — down from 42 percent in 2003.
Associated Press ^ | July 16, 2016
I won’t go back in time quite as far...
https://www.google.com/search?q=open+defecation+ngm&ie=&oe=