Filmmaker John Liu has documented the World Bank's $500 million loess plateau watershed rehabilitation project since it began in 1995. He has made at least two compelling films about the project, including a 22-minute version was shown at the recent Copenhagen climate conference, and a more detailed 52-minute version.
Watch the films here: http://eemp.squarespace.com/film-channel/
Or watch the Lessons film on Youtube.
Thanks to Tony for the tip.