Mangroves as Natural Coastal Shields: India's Ecosystem-Based Adaptation

India has a coastline of about 11,000 kilometres, where roughly 250 million people live and work. These coastal areas face growing climate threats, including rising sea levels in the Arabian Sea and the Bay of Bengal, saltwater entering farmland, and stronger cyclones and storm surges. To deal with these dangers, India has two broad choices. One is hard engineered structures such as seawalls, groynes, embankments, and tetrapods. The other is to use nature itself, an approach known as Ecosystem-based Adaptation, or EbA, which relies on biodiversity and natural ecosystems to reduce climate risk.

Mangroves are a powerful example of natural protection. When Cyclone Dana struck near Bhitarkanika on the Odisha coast, the area's mangroves helped absorb the force of the storm and shielded communities, doing a job that costly concrete structures often struggle to match. Along with mangroves, seagrass meadows and coral reefs act as natural buffers that slow down waves, hold soil in place, and reduce the impact of storms. Research describes India as a global hotspot for coastal EbA, with its mangroves protecting more people per hectare than in almost any other country.

Beyond protection, these ecosystems support livelihoods. In the Sundarbans, the large mangrove region in the Bay of Bengal, more than 18,000 women restored around 4,600 hectares of mangroves. This work helped reduce the damage caused by cyclones such as Amphan and Yaas, and also created income through activities like honey collection and crab farming. This shows that mangrove restoration brings both ecological and economic benefits to coastal communities.

Despite these advantages, hard engineering still receives most of the attention and money. Coastal States spent about Rs 2,641 crore on hard protection measures over the past decade, while the National Coastal Mission's budget fell from Rs 195 crore in 2022-23 to Rs 50 crore in 2024-25. Engineered structures remain useful in crowded urban areas, but they are expensive to maintain and can sometimes push the risk to nearby stretches of coast. In Kerala, for instance, hard barriers protected some spots while speeding up erosion in adjacent areas. A programme called the Mangrove Initiative for Shoreline Habitats and Tangible Incomes aims to restore 540 square kilometres of mangroves across nine States, though it is mainly described as a restoration effort rather than a climate adaptation measure.

For aspirants, this topic links environment, geography, and disaster management. Key points to remember include the role of mangroves, seagrasses, and coral reefs as natural coastal defences, the importance of the Sundarbans and regions like Bhitarkanika, and the idea of Ecosystem-based Adaptation as a cost-effective, nature-based way to protect both people and the environment along India's long coastline.