08:06People Fixing The WorldTurning mud into ‘clean’ concreteBBC World Service Duration: 23 minutes Tue 20th Jun 2023, 08:06 on BBC World Service Americas and the CaribbeanAvailable for over a yearListen nowThe man whose special powder turns waste soil into buildings. Show more GenresNewsFormatsDiscussion & TalkBrandPeople Fixing The World Source: BBC Online