How Mangroves Save Governments Billions

Mangroves might look unassuming, but they’re some of the most cost-effective flood defenses available.

A study published in Cell Reports Sustainability found that mangroves prevented about $4.75 billion in damages during hurricanes Irma and Ian in southwest Florida alone. And in one modeled county, they reduce storm surge damages by around $67 million yearly.

The researchers used high-resolution flood and economic loss models combined with detailed mangrove coverage data to quantify the difference mangroves make during extreme storms.

The results show areas protected by mangroves experience significantly less flooding than those without them during events like Hurricane Ian, as can be seen in the image below.

Florida is an ideal case study for this kind of analysis. It has a long, exposed coastline, faces tropical storms almost every year, and is home to some of the most valuable coastal real estate in the U.S.

Flood risk here directly shapes insurance availability, property values, and public spending.

If you’re searching for property in Miami, for example, real estate platforms prominently display flood risk data. That information can determine whether a home is insurable at all, and it has a direct impact on pricing.

For local governments, this translates into fiscal exposure when storms hit.

We’ve known for years that nature-based solutions like mangroves reduce flooding. What’s changed is our ability to measure their impact with precision.

Advances in modeling now make it possible to attach concrete dollar values to ecosystem protection — data that policymakers, insurers, and investors can act on.

And this makes securing funding for restoration and protection efforts easier than in the past.

Organizations like the following are already pushing mangroves as a frontline solution:

The Global Mangrove Alliance was launched at the World Ocean Summit in 2018 and brings together NGOs, governments, scientists, industry, and local communities around the shared goal of conserving and restoring mangrove ecosystems worldwide. They play a critical role in coordination and agenda-setting.

Nabat, a technology company based in the UAE, uses AI and autonomous drones to plant and monitor mangroves at scale. Spun out of VentureOne, the commercialization arm of Abu Dhabi’s Advanced Technology Research Council, they’re a compelling example of how tech can accelerate environmental restoration.

At the local level, organizations like Miami Water Keeper do the on-the-ground work that makes resilience tangible. Their efforts to protect South Florida’s waters include defending and restoring mangrove ecosystems that directly shield communities from flooding.

It’s this combination of organizations at different levels – global coordination, technological execution, and local stewardship – that turns restoration from isolated projects into durable coastal resilience, capable of delivering measurable protection at scale.

Flood protection isn’t the only benefit mangroves provide. They create critical wildlife habitat, improve water quality through natural filtration, and capture large amounts of carbon.

And markets already exist for companies to purchase carbon credits from mangrove restoration projects, with major buyers including Microsoft and Shell — a signal that these ecosystems are increasingly recognized as investable climate infrastructure.

As flood risks intensify, data like that from the study helps shift mangroves from “nice-to-have” conservation projects to essential public infrastructure, influencing how governments plan coastal budgets, how insurers price risk, and how capital flows into adaptation.

Here are some resources for those who want to dig deeper. It covers restoration costs, large-scale deployment, and global coordination:

Happy New Year! I’m excited to see how the blue economy continues to evolve in 2026. As always, if there’s anything you’d like to see featured or if you’d just like to talk, reply to this email.

🌱 Zané