Introduction : a theoretical overview / Thomas Homer-Dixon and Jessica Blitt -- The case of Chiapas, Mexico / Philip Howard and Thomas Homer-Dixon -- The case of Gaza / Kimberley Kelly and Thomas Homer-Dixon -- The case of South Africa / Valerie Percival and Thomas Homer-Dixon -- The case of Pakistan / Peter Gizewski and Thomas Homer-Dixon -- The case of Rwanda / Valerie Percival and Thomas Homer-Dixon -- Key findings / Thomas Homer-Dixon and Jessica Blitt.