Mass migration, driven by war and politics, has already fuelled social discontent in Europe and America. But things may get much worse if climate change continues unchecked and leaves millions in at-risk countries homeless.
Starting in 2015, Europe struggled on a large scale to cope with its biggest influx of refugees since the second world war. Hundreds of thousands fled and have been fleeing from the war-torn Middle East and beyond. Many have resorted to risky boat voyages to reach Europe, and thousands have perished in the process.