Policemen patrol next to a wall being built by Rio de Janeiro city hall to limit the expansion of the Dona Marta slum from encroaching on the forest in Rio de Janeiro May 29, 2009. Experts say the root problem is a severe housing shortage affecting Rio and the whole of Brazil. Under the government's flagship infrastructure program, known by the Portuguese acronym PAC, the federal authorities plan to build some 3,616 homes in four different Rio slums, according to Rio's Secretary of Public Works. The government also announced a 34 billion reais ($17.3 billion) housing plan for low-income families in the country in March, aiming to build one million homes by 2011. Picture taken on May 29, 2009. To match feature BRAZIL-RIO-WALLS/ REUTERS/Sergio Moraes (BRAZIL ENVIRONMENT SOCIETY)
REUTERS/SERGIO MORAES