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Abstract Moving away from hazardous areas may be an important adaptive response under intensifying climate change, but to date such movement has been controversial and conducted with limited government or private-sector support. Research has emphasized resident perspectives on mobility, but understanding how professionals view it may open new avenues to shape future outcomes. Based on 76 interviews with professionals involved in climate responses in South Florida, we evaluate perceptions of adaptation goals, the potential role of climate mobilities in pathways supporting those goals, and associated constraints and enablers. The practitioners interviewed anticipate multiple types of climate mobilities will occur in the region, at increasing scales. Interviewees perceive climate mobilities at present, especially migration and gentrification where climate plays some role, as causing distributional inequities and financial and sociocultural disruptions, and they view existing adaptive strategies as best serving those who already have adequate resources, despite practitioners’ personal commitments to social justice goals. Although many practitioners feel prepared for their own, limited roles related to climate mobilities, they judge the region as a whole as being unprepared to support the retreat they see as inevitable, with a need for a more ambitious long-term transition plan. Achieving this need will be difficult, as practitioners indicate that climate mobilities remain hard to talk about politically. Nevertheless, interviewees believe some households are already considering moving in response to climate risks. Discussions of climate mobilities, through interviews and far beyond, may encourage more mindful choices about and engagement in climate-driven transformations. 

Flood damage has severe and long-term repercussions for households and communities, and continued housing development in floodplains escalates damages over time. Policies and interventions to reduce damage depend on assumptions about housing stock and residents, but assessments of flood exposure to date largely focus on community-scale characteristics at a single point in time, masking potential within-community differences and their evolution through time. We measure residential development in the floodplain nationwide over time to characterize the type and value of U.S. floodplain housing stock and to assess how new development contributes to flood exposure. Over 4M U.S. residences built from 1700 to 2019 (4.8% of all residences built during that time) are located within current regulatory floodplains. These residences are concentrated at the affordable and expensive extremes of the housing value spectrum, reflecting deep differences in the social vulnerability of floodplain residents. Floodplain housing stock often differs substantially from the local market, with coastal floodplains containing relatively expensive housing and inland floodplains containing relatively affordable housing. New housing development has not occurred equally across these contexts. In the past two decades, more floodplain development has occurred in communities with relatively expensive floodplain housing, and mobile home construction in floodplains has slowed. The bifurcated patterns in floodplain housing, across values and geographies, demonstrate the importance of considering the specific population at risk and how it may differ from the broader community when tailoring flood risk management approaches.