A report released by the Switzerland-based Internal Displacement Monitoring Center on November 16, 2011 states that a full 90% of the world's disaster-related displacement, which forced more than 38 million people to leave their homes in 2010, was caused by climate change.

http://www.trust.org/alertnet/news/asia-pacific-refugees-of-climate-change-rising-steadily 
http://ipsnews.net/news.asp?idnews=105870