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Environmental risk assessment --- Coastal zone management --- Earth & Environmental Sciences --- Environmental Sciences --- Risk assessment --- Precautionary principle --- Environmental risk assessment.

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In view of uncertainties about the future threat environment, trajectories of technological development, and shifting budgeting priorities, RAND Project AIR FORCE examined analytical methods that would best guide the recently established Air Force Warfighting Integration Capability in capability development planning (CDP), as well as concept development and future force design. In their review, researchers found that specific methods of decisionmaking under deep uncertainty (DMDU) can provide the most suitable means for arriving at solutions that are flexible, adaptable, and robust and guiding investment pathways and modernization efforts. The method highlighted, Robust Decisionmaking, rests on a simple concept. Rather than using models and data to assess policies under a single set of assumptions, RDM runs models over hundreds to thousands of different sets of assumptions about the problem space with the aim of understanding how plans perform under many plausible conditions. Each of the four steps of RDM — decision-framing, case generation, vulnerability assessment and scenario discovery, and trade-off analysis — feeds into the next, providing stakeholders and decisionmakers with a more informed tradespace. By exposing vulnerabilities of different options under different scenarios, RDM can enable stakeholders to engage in a rich dialogue about which risks or vulnerabilities are acceptable, as well as to review assumptions made in framing the problem and make adjustments as needed.

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This report highlights RAND's contributions to the Louisiana Coastal Protection and Restoration Authority's Master Plan. Its purpose is to help policymakers in other coastal regions understand the value of a solid technical foundation to support decisionmaking on strategies to reduce flood risk, rebuild or restore coastal environments, and increase the resilience of developed coastal regions.

Coastal engineering -- United States -- Planning. --- Coastal zone management -- Louisiana. --- Planning -- Technique. --- Shore protection -- United States -- Planning. --- Coastal zone management --- Coastal engineering --- Shore protection --- Planning --- Sociology & Social History --- Social Sciences --- Communities - Urban Groups --- Technique --- Technique. --- Planning. --- Beach erosion --- Coast protection --- Coast protective works --- Prevention --- Hydraulic engineering --- Reclamation of land --- Engineering

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To establish an evidence-based foundation for the congressionally required short- and long-term recovery and resilience plan for Puerto Rico following the 2017 hurricanes, the Homeland Security Operational Analysis Center assessed the damage from the 2017 hurricane season and remaining needs across the commonwealth in collaboration with federal agencies, the government of Puerto Rico, and other stakeholders. The experts examined what happened during and after Hurricanes Irma and Maria but also how the effects of the hurricanes exacerbated and were exacerbated by predisaster challenges and stressors. This report provides a comprehensive summary of the commonwealth's challenges and status before and after the storms hit, including their effects on Puerto Rico's people and communities; economy; built and natural environments; and education, health, and social services. Before the hurricanes, Puerto Rico faced an economic crisis, a shrinking, aging population, substandard public education, poverty, poor housing stock, governance challenges, neglect of infrastructure and resources, and environmental degradation. Hurricane Maria's direct and devastating landfall on Puerto Rico in September 2017 only exacerbated these challenges. The research team identified short- and longer-term needs for Puerto Rico's recovery and resilience. In the short term, Puerto Rico needs to repair damaged critical infrastructure; improve governance and fiscal accountability; update emergency-preparedness plans; clearly delineate responsibility for infrastructure, assets, and services; and repair damaged and destroyed homes. In the longer term, Puerto Rico will need to systematically address its economic challenges; scale its social services and infrastructure systems for current and future populations; reinforce its infrastructure against natural hazards and build it to modern standards; reduce building-permit and code-enforcement breaches; report timely and accurate data on its economic and fiscal status; and gather further knowledge to inform long-term resilience decisions.

Hurricane damage --- Hurricane Irma, 2017. --- Hurricane Maria, 2017. --- Puerto Rico.