USAID. (2009) Climate Change, Adaptation and Conflict - A Primary Review of the Issues.

"The consensus of climate scientists on the probable harmful effects of climate change and the need for climate adaptation has grown stronger in recent years. However, knowledge about the potential links between climate change and conflict, as well as the appropriate climate adaptation measures to prevent or mitigate conflict, remains limited and underdeveloped. This discussion paper provides an initial examination of climate  change and climate adaptation, how and where climate change may be linked to conflict, and some of the implications of these linkages for development agencies.
Global temperatures have risen significantly over the last 100 years, with an accelerated warming trend beginning in the mid-1950s. According to the Intergovernmental Panel on Climate Change (IPCC), warming trends are projected to continue, and even if mitigation measures were immediately implemented, global warming would continue for decades. The consensus of climate scientists is that temperatures will rise between 2.0°C and 4.5°C by the end of the century.
Scientists have identified a number of ways in which increasing global temperatures may affect long-term climate patterns, including an increase in the incidence of both flooding and droughts, rising sea levels, and stronger, more frequent hurricanes and typhoons. If successful mitigation strategies are not adopted, hundreds of millions of people may face increasing pressure on water resources, damage to crops and dwellings, and exposure to extreme weather, diseases, and pests." USAID.