People are openly wondering why people in developing countries want to keep on cooking with dirty smoky stoves while there would be easy to use better cleaner alternatives. http://www.wired.com/2012/08/gates-foundation-toilets/

Reminds me of the switch from streetcars to cars - who in their right mind would want to start polluting the city? Maybe back then the air quality was atrocious anyway because of all the inner city industry and heating.