When mobility drivers are scrutinised and climate change is found to play a role in movement, it remains difficult to determine the extent of its influence. Although conditions in the Horn of Africa and Yemen are variously characterised by conflict, authoritarian regimes, poor governance, poverty, and mass displacement, along with harsh environments that produce negative climate change impacts, there is scant evidence that these impacts cause intercontinental and interregional mixed migration. The linkages are hard to locate. Climate change and environmental stressors cannot easily be disaggregated from the wide range of factors affecting populations, and even where some disaggregation is evident the results are not seen in the volume, direction, or destination choices of those affected.