Here's an article form 2010.
http://www.newsecuritybeat.org/2010/05/dod-measures-up-on-climate-change-energy/
Summary:
http://www.newsecuritybeat.org/2010/05/dod-measures-up-on-climate-change-energy/
Summary:
Assessments conducted by the intelligence community indicate that climate change could have significant geopolitical impacts around the world, contributing to poverty, environmental degradation, and the further weakening of fragile governments. Climate change will contribute to food and water scarcity, willincrease the spread of disease and may spur or exacerbate mass migration.

