To get a glimpse of the future, look to East Africa today.
The Horn of Africa is in the midst of its worst drought in 60 years: Crop failures have left up to 10 million at risk of famine; social order has broken down in Somalia, with thousands of refugees streaming into Kenya; British Aid alone is feeding 2.4 million people across the region.
That’s a taste of what’s to come, say scientists mapping the impact of a warming planet on agriculture and civilization.