Coral Reef

Welcome to Insta-Slum.

Haiti is the hellhole of the New World, but architect Vincent Callebaut has a solution in his Coral Reef; a "Inspired Carbon Neutral Eco Village".  Replete with all manner of greenery, these modular living units allow a thousand people to (somehow) grow their own food on small plots of land that I can't seem to find anywhere.  At any rate,

Aquaculture farms and grey water recycling plants filter and process the water before sending it into the sea. The entire complex is carbon neutral and powered via a number of different renewable energy sources. Power would be generated from thermal energy conversion under the pier, marine currents, vertical axis wind turbines, and solar photovoltaics.

Of course, seeing as Haiti isn't Hong Kong or Manhattan, you could just build small homes on normal plots of land, hook them up to a decent sanitation system, and then lay in a power grid with an honest-to-Fermi power plant that produces more power than the Haitians need so they can progress rather than never enough so they remain dirt poor, but where's the fun in that?