PORT-AU-PRINCE: Climate change, cholera and the return of thousands of emigrants from the neighboring Dominican Republican are fueling a humanitarian crisis in Haiti, the UN warned Tuesday. The impoverished Caribbean nation is facing a deluge of problems, pushing an already vulnerable population closer to the edge, said Enzo di Taranto, who heads Haiti’s UN Office for the Coordination of Humanitarian Affairs (OCHA). Among these pressures is a new cholera outbreak. Cases are up 300 percent in the first months of 2015 compared to the same period last year, di Taranto said in an interview with AFP. Haiti — the poorest country in the Americas — is already suffering from chronic instability and struggling to recover from a devastating 2010 earthquake that killed more than 250,000 people and crippled the nation’s infrastructure.