FILE - In this May 3, 2012 file photo, U.S. economist Jeffrey Sachs, who heads the Earth Institute at Columbia University in New York, prepares to answer a question during a news confer

 

              FILE - In this May 3, 2012 file photo, U.S. economist Jeffrey Sachs, who heads the Earth Institute at Columbia University in New York, prepares to answer a question during a news confer
FILE - In this May 3, 2012 file photo, U.S. economist Jeffrey Sachs, who heads the Earth Institute at Columbia University in New York, prepares to answer a question during a news conference in Manila. In late August, 2012, Sachs, the founder of the Millennium Villages Project, arrived in Silinga, northern Ghana to mark the launch of a new Millennium Village. Like 13 others in Africa, the site in rural northern Ghana will serve as a demonstration for how donors and national governments can help poor communities reach the Millennium Development Goals, a series of benchmarks for poverty alleviation laid out by the United Nations in 2000. (AP Photo/Bullit Marquez, File)