The system can sanitise the waste of ten people in two hours, leaving only sand and fresh(ish) water behind.

ECONOMIST: Monitor: Flushed with pride | The

Fresh from constructing a sea-level canal through the flat Egyptian sand, de Lesseps was determined, without having set foot in Panama and after only the vaguest of topographical studies, that his project through the mountainous central American isthmus would also be a sea-level canal, requiring no locks to cope with changes in altitude.

ECONOMIST: The Panama Canal

Habitats in the biosphere reserve comprise barrier islands, beach and sand dunes, salt marshes, maritime forests, tidal creeks, fresh and brackish water impoundments and open water areas.

UNESCO: Biosphere Reserve Information