"The stunningly beautiful Gorongosa National Park, once the crown jewel of Mozambique, was nearly destroyed by decades of civil war. It looked like a perfect place for Western philanthropy: revive the park and tourists would return, a win-win outcome for the environment and the impoverished villagers living in the area. So why did some researchers find the local communities actually getting hungrier, sicker, and poorer as the project went on? And...