Mallorca's Water Dilemma: One Million Trees vs. Another Desalination Plant 2026

Mallorca is at a crossroads in its fight against water scarcity: should it invest in a massive reforestation project—planting one million trees—or build another large desalination plant? The debate pits technological fixes against nature-based solutions, with significant implications for the island's environment and economy.

The Balearic Islands have long struggled with water stress, and the default response has been to ramp up desalination. But as the environmental costs of desalination become clearer, voices like that of Miquel Ramis are calling for a different approach. In an interview with elDiario, Ramis argues that for the same price as a desalination plant, Mallorca could plant a million trees, addressing the root causes of water scarcity while restoring ecosystems.

The Rising Tide of Desalination in Mallorca

Over the past decade, Mallorca's reliance on desalination has skyrocketed. According to the Mar Balear Report, desalinated water production on the island quintupled from 2.3 cubic hectometers in 2013 to 12.9 hm³ in 2022. And the machinery shows no signs of slowing: the administration plans to activate more desalination plants.

This "water factory" approach comes with a hidden cost. Beyond the substantial energy consumption, desalination plants discharge hypersaline brine—a byproduct that is far saltier than seawater. This brine is typically released back into the sea, where it can wreak havoc on marine ecosystems.

The Hidden Environmental Cost: Posidonia Oceanica Under Threat

One of the Mediterranean's most precious ecological treasures is Posidonia oceanica, a seagrass species that forms extensive underwater meadows. These meadows are biodiversity hotspots, carbon sinks, and natural water filters. But they are under siege from desalination brine.

A study by the University of the Balearic Islands (UIB) indicates that hypersaline discharges from desalination plants drastically increase oxidative stress in Posidonia oceanica. This stress can weaken the plants, making them more vulnerable to disease and reducing their ability to photosynthesize and grow. The loss of Posidonia meadows would have cascading effects on marine life and water quality.

Planting One Million Trees: A Nature-Based Solution

Miquel Ramis's proposal flips the script: instead of building more desalination infrastructure, invest in reforestation. Trees play a crucial role in the water cycle. They help retain soil moisture, reduce runoff, and can even enhance local rainfall through evapotranspiration. A million trees could significantly improve Mallorca's water retention capacity.

Moreover, forests act as natural filters, improving water quality as it percolates into aquifers. This could reduce the need for energy-intensive desalination and lessen the pressure on marine ecosystems. The cost of planting a million trees is estimated to be comparable to building a desalination plant, making it an economically viable alternative.

• Desalination provides a steady water supply but consumes large amounts of energy and produces toxic brine.
• Reforestation enhances water retention, improves soil health, and supports biodiversity but takes time to deliver results.
• Posidonia oceanica is vital for marine ecosystems and is threatened by desalination brine.
• Public investment in nature-based solutions can yield long-term environmental and economic benefits.
• Combining approaches—such as desalination with better brine management and reforestation—may offer a balanced path forward.

Comparing the Options: Desalination vs. Reforestation

To understand the trade-offs, it's helpful to compare the two approaches across key criteria. The table below summarizes the main differences.

What This Means for Mallorca's Future

The decision between desalination and reforestation is not just about water; it's about the kind of island Mallorca wants to be. Desalination offers a quick fix but perpetuates a cycle of energy dependence and ecological damage. Reforestation, while slower, addresses the root causes of water scarcity and enhances resilience. The background to this story is set out in Thames Water to Restart Desalination Plant Amid Drought. A related thread runs through Thames Water Desalination Plant Restart: A Costly White Elephant. Earlier coverage in Water Scarcity Despite Rain: Save Water Solutions shows how the argument developed.

However, the choice may not be binary. Experts suggest that a combination of measures—including improved brine management, water conservation, and reforestation—could provide a more sustainable path. The key is to move beyond the automatic reliance on desalination and consider the full spectrum of solutions. A closer look at the same subject appears in Water Scarcity in Rainy Regions: Causes and Solutions. Anyone following the wider picture can start with Water Scarcity Despite Rain: 5 Solutions to Save Water Now. The same theme surfaces in Water Scarcity in Rainy Climates: A Growing Crisis, which takes a different angle.

As the debate unfolds, stakeholders from government, environmental groups, and local communities will need to weigh the evidence and make informed decisions. The outcome will shape Mallorca's landscape and water security for generations to come. Context on how this played out before sits in Drought and Inequality: How Water Scarcity Hits Vulnerable UK. A companion piece, Water Scarcity in Rainy Regions: Why We're Running Out, approaches the same subject from another angle.

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