A view of a hillside where Haitians who lost their homes in the 2010 earthquake are living in precarious shelters, outside of Port-au-Prince August 24, 2012. An estimated 400,000 Haitians affected by the quake are living in precarious tents. Tropical Storm Isaac passed the Dominican Republic and headed toward Haiti on Friday, rumbling slowly west across the Caribbean after unleashing heavy rain on parts of Puerto Rico. REUTERS/Swoan Parker (HAITI - Tags: DISASTER ENVIRONMENT)