This report draws on the expertise of a large number of people. In particular, we appreciate the assistance provided by approximately 100 Sahelian scientists, decisionmakers, and farmers and herders with whom we spoke, Also, we are grateful to workshop participants, the advisory panel, and additional reviewers who helped us determine the scope of the work and reviewed it to ensure its accuracy. Of course, OTA remains responsible for the analysis and the report does not necessarily represent the views of individual members of the advisory panel.