@techreport{Castles2002,
author = {Castles, S.},
title= {Environmental change and forced migration: Making sense of the debate},
year = {2002},
URL = {http://www.unhcr.org/3de344fd9.html},
publisher = {United Nations High Commissioner for Refugees, Evaluation and Policy Analysis Unit},
address = {Geneva},
number = {Working Paper 70},
}