How U.S. aid is being used to address food security in sub-Saharan Africa

One of the biggest challenges facing sub-Saharan African nations is how to help farmers withstand climate and economic headwinds and produce food for a growing population. Critics say most U.S. aid dollars are going to U.S.-based companies with little involvement by locally-led groups closest to the problem. Fred de Sam Lazaro looks at two food startups in Ghana for his series, Agents for Change.