Europe is rethinking its approach to national security, moving beyond steel and concrete to embrace the strategic potential of the natural world.

Jessika Roswall, the European Commissioner for the Environment, Water Resilience, and a Competitive Circular Economy, has proposed a radical new doctrine: "rewilding" national borders to act as natural defense barriers against potential invasions. This concept, which reframes environmental restoration as a pillar of national security, marks a significant shift in how European states perceive their frontiers.

Speaking ahead of critical shifts in geopolitical security, Roswall argued that nature-based solutions—such as wetlands, dense forests, and complex terrain—provide a formidable defense against armored vehicles and infantry incursions. "Investing in nature and using nature as a natural border control is necessary," she stated, emphasizing that this strategy creates a dual dividend of heightened security and revitalized biodiversity.

The Strategic Logic of Green Fortifications

The proposal draws inspiration from successful initiatives in Poland and Finland, two nations that share sensitive borders with Russia and its allies. By allowing land near frontiers to revert to its natural state, these countries have essentially created "hostile terrain" that complicates cross-border maneuvers. For modern military forces, which rely heavily on speed and the mobility of heavy armored columns, wetlands and dense, unmanaged forests act as natural anti-access/area-denial (A2/AD) zones.

This "Green Security" approach moves away from traditional, static defenses like walls or barbed wire, which are costly to maintain and environmentally damaging. Instead, it leverages the inherent unpredictability of nature. As Roswall noted, "It is very difficult for big tanks to go through" swampy, rewilded environments. This strategy essentially turns the landscape itself into a tactical asset.

• Tactical Deterrence: Wetlands and dense forests increase the difficulty for rapid armored advancement.
• Environmental Co-benefit: Increased biodiversity helps combat the broader crisis of habitat loss.
• Cost Efficiency: Nature-based solutions require lower long-term maintenance costs compared to physical walls.
• Sustainability: "Sponge cities" and restored ecosystems simultaneously combat flood risks and droughts, addressing the dual security threats of climate change and conflict.

Beyond Borders: Security as an Environmental Issue

The EU environment chief’s rhetoric frames water security and food supply as non-negotiable elements of national resilience. In a world where water infrastructure is increasingly becoming a strategic target—as seen in conflict zones like Ukraine—protecting the hydrological cycle is now a matter of defense policy, not just environmental protection.

Roswall’s vision is not limited to borders; she advocates for the widespread implementation of "sponge cities" and natural water-retention landscapes across Europe. This is presented as an essential adaptation to a future marked by increased climatic volatility. The argument is clear: a country that cannot manage its own water or food supply is inherently insecure, regardless of the strength of its standing army.

A Global Paradigm Shift?

While the proposal is currently focused on the European context, the concept of "Environmental Security" carries profound implications for other regions, including East Africa. In a region where border management and security are often plagued by illegal movement and resource-based conflicts, the idea of leveraging the landscape for stability could find resonance.

However, the strategy is not without its critics. Security experts argue that while nature can slow an advance, it cannot replace the need for sophisticated surveillance, diplomatic deterrence, and intelligence capabilities. Additionally, the complete abandonment of border zones to rewilding may impact local communities and economic activity in those borderlands.

As nations increasingly grapple with the intersecting crises of the 21st century—from climate change to traditional geopolitical aggression—the EU’s shift toward nature-based defense represents a compelling, albeit untested, synthesis of ecological and security policy. If successful, it may well define the next generation of border management.