On the hills of Jian, pear and pine trees stand where terraced rice fields once covered the land.This tiny town outside China's western city of Chongqing has a small but vital role to play in preventing disastrous flooding on the nearby Yangtze River, the world's fourth longest waterway. The forestation project aims to address years of environmental degradation which has scarred China's west, even as the government spurs the region to develop even faster.