Earthquake survivors hold a sign as they block the main road to the airport during a rally to demand for food, shelter and other aid at Port-au-Prince February 11, 2010. Four weeks after an earthquake shattered its capital, Haiti remains in a precarious situation with no clear idea of how to house 1 million people living in the streets, Prime Minister Jean-Max Bellerive said. REUTERS/St Felix Evens (HAITI - Tags: DISASTER CIVIL UNREST)