Nature Capital in Small Island Developing States (SIDS) means biodiversity, landscapes and seascapes, the basis of economies and livelihoods, and so forth. What should not be forgotten is that it is also our primary defence system against the existential threat of climate change.
In their response to coastal impacts from climate change, many governments have often prioritized hard engineering solutions for protection against sea-level rise, storm surges, and erosion, such as groins, seawalls, and complex geo-engineering. But for those of us living in SIDS, we know that an effective technology is our Natural Capital:
- Coral reefs: They don’t just look good on postcards. A healthy, structurally sound reef can dissipate up to around 97% of wave energy, functioning as a massive natural breakwater that, when conditions allow, can regenerate.
- Mangroves: These are our coastal shock absorbers. Their dense root systems stabilize shorelines, trap sediments, and reduce wave and storm-surge energy that would otherwise damage or destroy infrastructure.
- Coastal dune vegetation: Rising just beyond the reach of the high tide, coastal dunes form another critical line of defense. Vegetation adapted to salt spray, shifting sands, and high winds helps bind dunes together, reducing erosion and enabling faster recovery after storms.
- Coastal and inland wetlands: Often described as the “kidneys” of the landscape, wetlands act as transition zones between sea and land. Whether salt marshes along the coast or freshwater swamps inland, they function as natural “sponges,” absorbing, storing, and slowly releasing excess water during heavy rainfall and floods.
By using Nature-based Solutions (NbS) we can also act with nature, strengthening Natural Capital. One such example is agroforestry. When we move away from monoculture, we aren’t just farming we are building soil systems that retain moisture, improve structure, and reduce erosion, helping withstand the dual threats of drought and deluge.
The bottom line is that investment in climate adaptation in SIDS shouldn’t just go toward concrete. It must also go toward protecting and restoring Natural Capital. This is a high-yield infrastructure investment because the smartest strategy is to strengthen the shield nature already gave us.
Dr. Nirmal Shah