TY - BOOK AU - FAO TI - A REVIEW OF THE ENVIRONMENTAL FACTORS THAT IMPACT ON FOOD SECURITY AND LIVELIHOOD TRENDS OF PASTORALISTS AND AGRO-PASTORALISTS IN THE GREATER HORN OF AFRICA (GHA) AV - HD 9016 .A74 2005 PY - 2005/// CY - ROME PB - WFP ER -