Sustainable tourism: Can visitors save Denmark’s Wadden Sea?

The North Sea edges closer to an overgrown dike, sending an occasional spray of frigid, gray water toward Klaus Melbye.

It brings back memories of a massive storm that struck this area a quarter century ago. Melbye recalls that water levels crested more than 7 feet above sea level, almost overwhelming the clay barrier that prevents the ocean from flooding Denmark’s farmland.

“We got lucky that day,” says Melbye, director of the Wadden Sea Centre, a visitor center in Ribe, Denmark, that serves as a gateway to the Danish Wadden Sea National Park. The storm lasted only a few hours and subsided during a low tide.

But that luck may not hold. 

It isn’t a question of if the North Sea will flood this coastline, but when. This existential threat defines life in this Nordic country, where people have been pushing back against the water for centuries. For the residents of this UNESCO World Heritage Site, which is also Denmark’s largest national park outside of Greenland, sustainability is not a convenient catchphrase. It’s a matter of survival.

The Wadden Sea is also ground zero in a fight to preserve an entire ecosystem, which extends from the Netherlands to Germany and Denmark. This protected area is the central pit stop on the East Atlantic Flyway for up to 15 million migratory birds. 

Visitors can see this urgent adaptation unfolding in real time, observing the shift from stubborn resistance to radical collaboration.

The failure of the walls

The sea-facing side of a dike near Ribe. (Photo by Aren Elliott.)

For generations, the solution to containing the sea has been massive engineering: building dikes to reclaim land. But recent experience suggests that method may no longer work.

While the last century saw sea levels rise by just 4 inches, Melbye estimates that the next 50 years will bring a terrifying acceleration. Sea levels could rise by as much as 1 ½ feet.

This dramatic forecast is forcing Europe to scramble. But traditional methods are already showing cracks. Germany and the Netherlands are building dikes up to 36 feet. 

“But the seawater is going under the dikes,” says Melbye. 

Jens Hansen points to a bird-watching building near a nature protection area in Wadden Sea National Park. (Photo by Aren Elliott.)

Is collaboration a radical cure?

Faced with a devastating climate crisis, Denmark is considering a counterintuitive and profound response: strategic retreat. The leading scientific discussion in Denmark is now focused on working with the sea, not against it.

This kind of radical, adaptive thinking — giving land back to the sea — requires a unique governance structure. It demands consensus, not compulsion, according to officials. This is where Jens Laurits Hansen, who works at the National Park Office on the island of Rømø, defines Denmark’s fundamental conservation strategy.

Hansen’s office is tasked with safeguarding the future of the Wadden Sea, but it operates without the kind of authority granted to other national parks. 

Hansen explains that, unlike the much more top-down approach seen elsewhere, the Danish National Park model is built entirely on voluntary partnership. 

“We don’t have the authority to dictate anything,” he says. “We have to do all our projects on a voluntary basis.”

This collaborative philosophy is the key to local sustainability. Hansen notes that while the process of securing an agreement with landowners can be lengthy, the final solutions are far more long-lasting because people are a part of it. 

“When the community is involved, the conservation goals—like flood protection and ecosystem health—become inherently sustainable, ensuring they last long after the government funding runs out,” he explains.

You can see this strategy in action with the dike reinforcement on Rømø. Hansen’s team needed enormous amounts of clay, but they chose to dig it locally. This single decision saved them from hauling 13,500 truckloads of clay, dramatically cutting carbon dioxide emissions and simultaneously creating the Juvre Engsø bird refuge out of the excavated area. It plans the same approach when it comes to protecting the land against the ocean — and ultimately, how high to build the dikes.

Other projects include buying a 170-acre farm with plans to remove toxins and create wet areas to improve biodiversity. 

The most important part? 

“They will open the area to the public, so we can go and see the processes of nature restoration,” he says.

If you’re visiting the Wadden Sea, you might also get roped into being a conservationist for a day. Hansen’s office runs a program called BABINE, which recruits tourists to help clear open spaces to create more habitats for birds and butterflies. The goal is to promote sustainable conduct as the new normal. But it’s not the only program for visitors.

Pacific and Atlantic oyster shells, side by side at the Wadden Sea Centre. (Photo by Aren Elliott.)

The gastronomic intervention

The most immediate way tourists can witness and participate in the survival mission is by joining the hunt for the invasive Pacific oyster.

These foreign oysters, originally imported from Japan and Southeast Asia, spread rapidly after escaping from ill-conceived aquaculture projects. They now form massive reefs, displacing the native blue mussels that are a vital food source for ducks and other wading birds. 

The solution is brilliant: The park encourages visitors to eat as many of the invaders as they can, for free. The national park offers oyster tours from October to March, when they are safe to consume. Visitors, equipped with buckets and knives, can walk out onto the seabed to forage for a free delicacy and also help the ecosystem.

This unusual blend of tourism and triage is key to the park’s function that extends to its buildings. For example, the Wadden Sea Centre, which acts as a key gate to the national park, was built using local, natural materials, relies on ground heat, and uses solar cells to maintain power.

What’s at stake in the Wadden Sea

Behind the dike are kilometers of farmland, towns, and urban areas, all on flat terrain. (Photo by Aren Elliott.)

The Wadden Sea is under threat from all angles: an encroaching sea, invasive species and a shrinking ecosystem. 

Melbye shared grim new scientific evidence that climate change is actually shrinking the bodies of the migratory birds. Because Arctic summers are warming, the insects they rely on are hatching earlier. When the birds arrive, they miss the peak food supply, which means the chicks are smaller and the adults are getting smaller.

Officials hope that tourism will help make the area sustainable. Visitors can come here to harvest invasive oysters, help create habitats for the migratory birds, and spend their tourism dollars and kroner. 

The Wadden Sea is an irreplaceable larder. By turning tourists into active conservationists and daring to question centuries of engineering tradition, the Wadden Sea National Park is building the global blueprint for how humanity must adapt to the unforgiving pressures of a changed climate. Whether it succeeds remains an open question.