Climate has been a major driver of armed conflict in Africa, research shows - and future warming is likely to increase the number of deaths from war.
US researchers found that across the continent, conflict was about 50% more likely in unusually warm years.
Writing in Proceedings of the National Academy of Sciences (PNAS), they suggest strife arises when the food supply is scarce in warm conditions.
Climatic factors have been cited as a reason for several recent conflicts.
One is the fighting in Darfur in Sudan that according to UN figures has killed 200,000 people and forced two million more from their homes.