Blue Economy Sector
Coastal Resilience & Adaptation
Evaluating the economic trade-offs between hard defensive infrastructure and nature-based solutions.
As sea levels rise and storm surges intensify, coastal communities face an existential and economic threat. The traditional approach of building seawalls (hard infrastructure) is increasingly being compared against nature-based solutions (soft infrastructure) like mangrove restoration and oyster reef construction.
The Cost of Inaction
Global coastal assets vulnerable to a 1-meter sea-level rise are valued at over $14 trillion. Without intervention, annual damages are projected to reach $1 trillion by 2100.
Adaptation ROI Estimator
Comparing Approaches
Hard infrastructure provides immediate, quantifiable protection but disrupts natural sediment flow and requires high maintenance. Nature-based solutions provide co-benefits (carbon sequestration, habitat creation) but require space and time to mature.
| Method | Initial Cost | Ecological Impact |
|---|---|---|
| Concrete Seawall | High ($20M-$30M/km) | Negative |
| Mangrove Restoration | Low ($2M-$10M/km) | Positive |
| Hybrid (Living Shorelines) | Medium | Positive |
See our SST Anomaly data for models on changing storm intensity.