According to dominant narratives about adaptation to climate change, those facing worst-case scenarios, without means at their disposal to adapt in situ, face an ineluctable set of adaptation strategies that ultimately includes the permanent abandonment of geographic spaces rendered uninhabitable and unproductive for human use. Yet environmental stress and adaptive capacity are distributed unevenly, and power structures play a role in fashioning them. It is argued here that when access to land and water are impacted by environmental stress, the structures that mediate their access are reinforced, even as the adaptive alternatives for smallholders are undermined. In this way, dominant resource regimes set up migration as the primary viable alternative for adaptation among a dwindling set of choices. This framework is applied to two early analogues of climate change impacts: flooded Garífuna villages of Honduras's North Coast and communities enduring glacier recession and shifting hydrologic regimes in Peru's Cordillera Blanca. In both cases, stress motivates new forms of migration that reinforce dominant power structures. In Honduras, migrants from wealthier social strata are moving on a more permanent basis, and in Peru, the once historical pattern of labor migration is becoming a practical necessity. These cases underscore the role of political economy in adaptation to climate change and adaptive migration in particular.

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Recurrent summer floods along the Brahmaputra river and its tributaries are a major challenge for the people and state governments of Northeast India. While riverine communities in the region rely upon a variety of adaptation strategies to live with these destructive floods, climate change is expected to further exacerbate this challenge, as melting Himalayan glaciers and changes in the South Asian monsoon lead to an increase in the frequency of severe floods. At the same time, a multitude of new dams are under construction in the Brahmaputra river basin, to meet India’s growing energy demands. Though these dams could provide flood protection for downstream communities, political and economic factors have led dam-builders to prioritize hydroelectricity generation over flood control. Furthermore, hydroelectricity generated along the Brahmaputra is “evacuated” to distant urban centers, while rural dwellers in Northeast India suffer from high levels of energy poverty. Using the Ranganadi Hydroelectric Project in Arunachal Pradesh as a case study, this paper examines how, by changing the flood regime and undermining current adaptive strategies, large dams along the Brahmaputra are testing the capacity of downstream communities to live with summer floods. This work highlights the ways in which poor and vulnerable communities in Northeast India are forced to bear the costs of both climate change impacts and decarbonization efforts.

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