I think the information is now in the hands of the locals. An education campaign is underway. There is also an incentive program to allow ownership, so that the yield from the land will directly benefit the farmers and it will be in their self interest to use optimal farming practices.
Your point is well taken: In times of want, one doesn't worry about saving seed for the future, or preserving soil for next season. One worries about eating. Survival is a strong motivator.
RE: Regreening the Cradle of Chinese Civilization