As this year's emergency winds down, the question on aid workers' minds is, "How can the Sahel break from its recurring cycle of food crises?" U.N. Regional Humanitarian Coordinator for the Sahel, David Gressly, said now is the time to end chronic food insecurity. Aid agencies say they are working to build the "resilience" of the most vulnerable communities, but more needs to be done. (..) Aid agencies also say that prevention is cheaper than treatment.