Acute and Chronic Erosion is the Unpriced Climate Risk

Erosion is the next unpriced risk
The fundamental challenge lies in how we price risk. Traditional insurance models are designed for sudden events that are statistically rare but high in impact. Any form of erosion is excluded from standard homeowners' policies because it is a predictable process.

This results in widespread mispricing in the market. When coastal assets are appraised by investors or lenders, the ESG process considers a present-day view of inundation risk but does not account for changes to the surrounding land. In many parts of the world, erosion rates can rise up to 2 metres per year, exposing the asset not just to inundation but potential business disruption (if for example, beach access is required). These ripple effects extend far beyond asset owners, impacting mortgage lenders, municipal tax bases, and municipal bond ratings.

Shifting from resistance to resilience
Historically, our response to erosion has been "hold the line", building sea walls and bulkheads to keep the ocean at bay. However, modern thought leadership in coastal management suggests a paradigm shift toward "resilience" rather than just "resistance".

Engineering-heavy solutions often provide a false sense of security while inadvertently exacerbating erosion further down the coast. In contrast, nature-based solutions, such as dune restoration, living shorelines, and wetland preservation, offer a dual benefit. They act as shock absorbers for acute storms while slowing the pace of chronic land loss. From a finance perspective, these "green and blue" infrastructures should be viewed as depreciating assets that require sustained investment, similar to any other critical utility.

The financial sector must make waves
Closing the protection gap requires innovative financial instruments. We are seeing the emergence of "Blue Bonds", which attempt to monetize the protective value of healthy ecosystems. Furthermore, the financial sector must demand better data integration. Predictive modeling that combines LiDAR technology with climate projections can allow banks and insurers to transition from reactive claims-handling to proactive risk management.

For institutional investors and policymakers, the goal is not to abandon the coast, but to stabilize it through strategic public and private investment. This involves "managed retreat" in some areas and "fortified development" in others.

Our read at Ocean Ledger
At Ocean Ledger, we see acute and chronic erosion as both a technical problem AND a financial one. The data problem is that we treat slow change as noise even when it drives cumulative loss larger than a single event. The financial problem is that our risk systems price only what they can trigger.

That’s why we’re building stochastic coastal modeling tools that incorporate sub-peril drivers like erosion over time, in the same probabilistic terms insurers use for hurricanes. The aim is to bring chronic change inside the models that move money: adaptation funding, insurance pricing, and capital allocation. By turning “uninsurable risks” into numbers that speak, we can start making erosion investable, translating resilience into payoffs, and ultimately make it bankable.

Oceanology International 2026 to spark more urgency
Oceanology International 2026 (Oi26) provides the scene to discuss amongst stakeholders how coastal erosion is no longer just an environmental issue; it is a balance-sheet issue. The COAST exhibition zone will bring together developers, engineers and local authorities; this is our opportunity to discuss how we can collectively create a climate-resilient economy.

•    Visit Ocean Ledger at Oceanology International 2026 (Oi26) on Stand S300. The world’s leading forum for ocean science, engineering and technology returns to Excel London from 10th to 12th March 2026, connecting more than 8,000 attendees and with every continent in the world represented. For more information or to register, visit the Oi26 website.