Climate change is increasing risks for coastal communities, especially due to sea level rise and more frequent extreme events. Global mean sea level has already risen by about 0.2 m since the early 20th century, and projections indicate a rise between 0.63 m to over 1.01 m by 2100 under high-emission scenarios. These changes are making traditional protection strategies less effective and more expensive over time. Climate-related disasters have already caused approximately $3.64 trillion in global economic losses from 1970 to 2019, and coastal flood damages alone could exceed $1 trillion annually by 2050 without significant adaptation. In this context, adaptation is not only an environmental necessity but also an economic imperative. Managed retreat, defined as the planned relocation of people and assets away from high-risk areas, is emerging as a key strategy to reduce long-term exposure, avoid escalating costs, and support resilient development.

This research identifies managed retreat as a necessary but still underused climate adaptation strategy, particularly in response to sea level rise. While many cases have been reactive, the study highlights a shift toward proactive planning driven by both increasing risks and strong economic evidence.

Climate-related disasters have already caused about $3.64 trillion in global losses from 1970 to 2019, and coastal risks are expected to grow rapidly. Earlier estimates suggest that annual global flood losses could rise from a few billion dollars to over $1 trillion by 2050 without adaptation, while socio-economic growth alone could drive damages to around $52 billion per year. When climate change and land subsidence are included, annual losses may exceed $1 trillion by mid-century. In addition, between $7 and 14 trillion of coastal assets could be exposed by 2100, and adaptation costs for ports alone are estimated between $223 and 768 billion before 2050. These figures show that maintaining development in high-risk coastal areas is economically unsustainable.

The paper demonstrates that “hold-the-line” strategies, such as hard coastal defenses, involve high and rising costs over time, often leading to inefficient long-term investments and infrastructure lock-in. In contrast, managed retreat can reduce cumulative costs by avoiding repeated damages and long-term liabilities. Evidence shows that post-disaster buyout programs can generate significant returns, with studies indicating benefits of up to $6 for every $1 invested.

Retreat also creates additional economic value by enabling ecosystem restoration, which provides services such as flood protection and carbon storage. Importantly, timing is critical: proactive retreat is more cost-effective than reactive relocation, as delays increase both financial and social costs.

Overall, managed retreat emerges as a rational economic strategy for climate adaptation, capable of reducing long-term losses, avoiding inefficient investments, and supporting more resilient land-use systems in the face of growing climate risks.

Sea level rise and climate-related hazards are increasing both in frequency and intensity. Scientific projections indicate that sea levels could rise by up to 1 meter or more by 2100, with significant regional variation. These changes pose growing risks to infrastructure, ecosystems, and coastal populations.

Managed retreat is defined in the study as the planned and strategic relocation of people, infrastructure, and activities away from high-risk areas. While it has traditionally been framed as a last-resort response, the paper repositions it as a central climate adaptation strategy. This shift reflects the recognition that reducing exposure is often more sustainable than attempting to resist or control environmental processes.

The study argues that adaptation should move beyond a sole focus on protection. Hard defenses can be effective in the short term but are often costly, inflexible, and vulnerable to failure under extreme conditions. In contrast, retreat enables a realignment of human systems with environmental dynamics, supporting long-term resilience, sustainable land use, and the integration of ecological processes.

 The study adopts a multidimensional approach to assess managed retreat as a climate adaptation strategy, combining climate science, risk analysis, economic evaluation, and governance perspectives. Using sea level rise projections, including estimates of up to 0.63-1.01 m by 2100, the research evaluates exposure of infrastructure, ecosystems, and populations, highlighting the increasing limitations of protective strategies.

Managed retreat is also analyzed within the framework of disaster risk reduction, particularly in alignment with the Sendai Framework, which emphasizes prevention and risk mitigation. The study examines how retreat can be integrated into long-term planning, especially in contexts where structural defenses are not viable.

Environmental assessment plays a key role in the methodology, with attention to how retreat can enable ecosystem-based adaptation. The restoration of coastal ecosystems is evaluated not only for its ecological benefits but also for its contribution to risk reduction.

The research further incorporates case studies to explore governance and social dimensions, emphasizing the importance of trust, participation, and procedural justice. These elements are identified as critical for the successful implementation of retreat policies.

Finally, the methodology includes economic analysis comparing the costs of inaction with the benefits of planned relocation. This comparison highlights the long-term advantages of proactive retreat, identifying opportunities for reinvestment and transformation while reducing future financial and social risks.