"The biggest problem, in the short-term, is sanitation because everyone is moving into makeshift camps," Clinton said. "I wanted originally, compost toilets for everyone because you treat the waste you remove the disease and then turn it into fertilizer."

Clinton said that he met with young Haitian architects on Thursday, "who believes he has developed a plan for housing which is earthquake and hurricane resistant."

"Haitians aspire to have you come to Haiti as tourists, not donors," Clinton said. "They want to build a country that can stand on its own two feet."

The emergency phase of humanitarian relief operations will have to continue for many months. While improvements have been made in the ability to reach those in need with food, water, healthcare and shelter, humanitarian needs in Haiti remain great. Until the situation stabilizes, and given the urgent need to prepare for the rainy and hurricane seasons, relief and early recovery must increase and be expanded to more people and to so far unreached parts of the country.

"The particular complexity of an earthquake on this scale is that wee need to embark on early recovery, even as we provide emergency relief," he said. "Before last month's disaster, we had a plan for Haiti's long-term development and reconstruction. Our challenge today is to reformulate that plan to help Haitians ' build back better.'"

"We have to be engaged in Haiti for the long haul, for life- saving relief as well as reconstruction," said John Holmes, the UN under-secretary-general and emergency relief coordinator. "To meet the needs of the people of Haiti will require more o the generous global support that we have seen so far."

Since the initial Flash Appeal was fully funded, with those funds being put against the new revised Humanitarian Appeal, and with some projects already having funding, unmet requirements for this emergency in 2010 are 768 million U.S. dollars.

The size of the revised appeal reflects the scale of the catastrophe, the unmet needs, and the necessity of putting into place the right early recovery basis for reconstruction. Like all appeals, this revised Haiti Humanitarian Appeal will be reviewed mid-year, and if necessary revised.

Previously, the largest natural disaster appeal was issued in 2005 for the Indian Ocean Earthquake-Tsunami, which sought some 1. 41 billion U.S. dollars.