The power of mangroves over seawalls

Context: The landfall of Cyclone Dana near Bhitarkanika on Odisha’s coast has highlighted the powerful protective role of coastal mangroves over expensive, engineered infrastructure.

About The power of mangroves over seawalls:

What is Ecosystem-based Adaptation (EbA)?

• Ecosystem-based Adaptation (EbA) is a nature-centric climate strategy that uses biodiversity and ecosystem services to help communities adapt to the adverse impacts of climate change. Unlike traditional engineered “grey” infrastructure, EbA harnesses natural habitats like mangroves, seagrass meadows, and coral reefs to act as dynamic, self-sustaining buffers.

Key Data and Statistics on India’s Coastal Adaptation:

• Vulnerable Demographics: India manages an ecologically fragile 11,000-kilometre coastline that is home to approximately 250 million people whose lives and homes are directly threatened by climate hazards.
• Skewed Adaptation Spending: Over the last decade, Indian coastal states spent a massive ₹2,641 crore on hard engineered protection measures like seawalls and groynes.
• Declining Green Budgets: Reflecting a stark preference for visible infrastructure, the National Coastal Mission’s public budget fell sharply from ₹195 crore in 2022–23 to just ₹50 crore in 2024–25.
• Proven Grassroots Success: Demonstrating scale, over 18,000 women in the Sundarbans successfully restored 4,600 hectares of mangroves, effectively blunting the destruction of cyclones Amphan and Yaas.

Key Features of Mangroves as Climate Shields:

• High-Density Wave Attenuation: The intricate, tangled aerial root networks of mangrove forests structurally break the energy of incoming waves, reducing the destructive force of storm surges.
• Dynamic Sediment Accretion: Mangroves naturally trap organic sediment within their root bases, helping the coastline adapt to rising sea levels by physically building up the soil elevation over time.
• Robust Ecological Shielding: Research identifies India as a global “hotspot” for coastal EbA, proving that mangroves protect more people per hectare than almost any other country.
• Exceptional Carbon Sequestration: Mangrove systems function as superior blue carbon sinks, locking away atmospheric carbon dioxide at rates manifold higher than terrestrial tropical rainforests.
• Operational Longevity and Cost-Efficiency: Unlike rigid concrete blocks that degrade and require constant repair, mangrove ecosystems are self-repairing and grow stronger over time if left undisturbed.

Challenges Associated with India’s Coastal Adaptation Policy:

• Risk Displacement by Engineered Measures: Hard concrete infrastructure often shifts wave energy rather than absorbing it, accelerating erosion and damage in adjacent, unarmored coastal zones.
• Severe Institutional and Policy Terminology Ambiguity: The policy space is cluttered with overlapping labels like Nature-based Solutions (NbS), Eco-DRR, and EbCA, creating widespread confusion over what officially qualifies as an adaptation action.
• Concealment Within Broader Sectoral Schemes: Many adaptation initiatives are buried inside generic forestry or development plans, meaning their climate benefits are rarely assessed or recorded separately.
• Fragmented Administrative Mandates: Coastal management suffers from split institutional duties and weak monitoring frameworks, which favors highly visible infrastructure over nature-centric projects.
• Framing Disconnect in National Programs: Flagship programs like MISHTI (which targets 540 sq. km of mangrove restoration) are primarily framed as conservation programs rather than core climate adaptation strategies.

Way Forward:

• Enacting a Clear National Coastal EbA Taxonomy: Formulate precise legal definitions and classification systems to identify, monitor, and fund ecosystem-based adaptation independently of standard forestry projects.
• Integrating Nature-Based Targets into Coastal Planning: Move from isolated, ad-hoc restoration projects to a coherent national strategy that embeds mangrove and seagrass cultivation into state disaster management laws.
• Restructuring Budgets to Favor Green Capital Over Grey: Shift public infrastructure funding away from high-maintenance seawalls to restore the financial capacity of the National Coastal Mission.
• Institutionalizing Community-Led Hybrid Protection Models: Scale up the Sundarbans model by financially backing self-help groups and women’s cooperatives to lead local restoration, ensuring clear economic co-benefits.
• Aligning Local Metrics with the Global Goal on Adaptation: Build rigorous, data-driven monitoring networks to track the protective performance of ecosystems, ensuring India’s green shield is properly counted in international climate finance.

Conclusion:

India’s heavy reliance on rigid, concrete seawalls provides temporary relief but ultimately shifts and worsens long-term erosion risks along its fragile coastline. The proven success of mangrove systems during intense cyclones demonstrates that investing in natural capital is both economically sound and socially equitable.