The ‘secret weapon’ in fight against climate change — Planting eelgrass
Beneath the surface of coastal waters lies a quiet ally in the fight against climate change. Eelgrass, a type of seagrass found along temperate shorelines, is emerging as one of the most powerful yet overlooked tools for tackling the environmental crisis. As researchers and conservationists ramp up restoration efforts worldwide, eelgrass meadows are gaining recognition not just for their beauty or biological richness but also for their potential to store carbon, protect coastlines, and support marine life. Often referred to as a “secret weapon” in the climate fight, this underwater plant could help shape a healthier, more resilient planet.
Eelgrass plays a key role in what scientists refer to as “blue carbon” – the carbon stored by ocean and coastal ecosystems. It is remarkably efficient at capturing and storing carbon dioxide, removing it from the atmosphere and locking it away in the seafloor. Studies show that seagrasses, such as eelgrass, can sequester carbon up to 35 times faster than tropical rainforests. What makes it even more remarkable is that the carbon captured by eelgrass can remain trapped in low-oxygen marine sediments for hundreds or even thousands of years. Though it covers less than 0.2% of the ocean floor, seagrass accounts for about 10% of the carbon stored in the ocean, making it a disproportionately effective climate solution. In many ways, eelgrass acts like an underwater forest, working silently to clean the air and cool the planet.
But eelgrass doesn’t just help the climate. It also plays a central role in the ocean’s web of life. These meadows provide vital shelter and breeding grounds for countless marine creatures. Juvenile fish, crabs, scallops, and other invertebrates thrive among the swaying blades, using them as a refuge from predators. Many of these species are also economically important, making eelgrass restoration a smart investment in both biodiversity and coastal livelihoods. In addition to serving as habitat, eelgrass helps feed a variety of marine animals and migratory birds. It also acts as a natural filter for the ocean, trapping sediments and absorbing excess nutrients, such as nitrogen and phosphorus, which can otherwise pollute coastal waters. As a result, eelgrass promotes clearer water and a healthier overall marine environment.
In an era of rising seas and stronger storms, eelgrass is proving to be a natural shield for coastal communities. Its dense roots anchor sediment in place, reducing erosion and stabilizing fragile shorelines. The blades themselves help to absorb and dissipate wave energy, lessening the impact of storm surges and high tides. Unlike concrete seawalls or other artificial infrastructure, eelgrass meadows can regenerate and adapt over time, making them a cost-effective, self-sustaining form of coastal protection.
Despite these many benefits, eelgrass meadows are under threat. Around the world, they are shrinking at an alarming rate due to pollution, dredging, poorly managed coastal development, boat traffic, and climate change. Warmer ocean temperatures and changing sea levels can stress or even wipe out entire beds. Once lost, eelgrass habitats can take years or decades to recover, if they recover at all. That’s why restoration efforts have become a growing focus for environmental groups, researchers, and local governments. Projects to replant eelgrass using seeds or shoots from healthy meadows are already underway in locations such as British Columbia, the Chesapeake Bay, and parts of Northern Europe. These efforts require patience and precision, but early results are promising.
Planting eelgrass is more than an ecological restoration project—it’s a strategic investment in the future. By protecting coastlines, capturing carbon, and fostering biodiversity, eelgrass offers a triple win for climate, people, and nature. But to scale these efforts, more support is needed from policymakers, funders, and the public. Increasing awareness about eelgrass and its benefits is a critical step in ensuring this solution is not overlooked.
As the world searches for effective ways to reduce carbon emissions and adapt to a changing climate, eelgrass reminds us that sometimes the answers are already rooted in nature. With greater attention and support, this humble underwater plant could become one of the most powerful tools we have to build a better, more resilient world beneath the waves—and above them.
