Control, Adapt or Flee. How to Face Environmental Migration? UNU EHS, InterSecTions No. 5/07.
Klimaflüchtlinge. Die verleugnete Katastrophe. Universität Hamburg, Studie im Auftrag von Greenpeace Deutschland.
Climate Change and Conflict: The Migration Link. Coping with crisis. Working Paper Series, International Peace Academy.
A European strategy for sustainable, competitive and secure energy. Green Paper, Brussels.
Energy in a Changing World. Clingendael Energy Papers No.11.
Energy and Security: Toward a New Foreign Policy Strategy. Woodrow Wikson Press/John Hopkins University Press.
Global Security Brief 1: Oil Price Surge Threatens Economic Stability and National Security. Washington, D.C.: Worldwatch Institute.