The deadly combination of high temperatures and low rainfall that affected millions in the Horn of Africa was made about 100 times more likely by climate change.
The study found that while climate change has not had much impact on the total annual rainfall in the area, higher temperatures have significantly increased evaporation from soil and plants.
The drought, which is driving conflict and leaving millions without enough food, was made 100 times more likely by climate change from human activity, according to the World Weather Attribution group.