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Nestled in the heart of Pomerania, away from the well-trodden paths to Gdańsk or Warsaw, lies Koszalin. To many, it is a quiet administrative center, a dot on the map between the Baltic spits and the undulating lake districts. But to look at Koszalin merely as a city is to miss its deeper essence. It is, in truth, a living archive written not in parchment, but in stone, sand, and peat—a profound geological diary that speaks directly to the most pressing crises of our time: climate change, energy transition, and the fragile balance between human development and the ancient Earth.
To understand Koszalin’s terrain is to rewind the clock to the Pleistocene, an epoch of colossal forces. The entire narrative of this region was scripted by the last advance and retreat of the Scandinavian Ice Sheet, the mighty Weichselian Glacier.
The most dramatic characters in this story are the end moraines. As the glacier, a mile-thick river of ice, made its final, grinding stand some 20,000 years ago, it became a colossal conveyor belt, pushing and depositing unimaginable amounts of debris at its edge. The result is the "Koszalin Heights" or "Koszalin Plateau" – a series of rolling hills and ridges that arc through the landscape. Driving south from the city, the gentle climb is not incidental; you are ascending a terminal moraine, a literal wall of rubble left by a dying glacier. These hills, composed of unsorted till (a chaotic mix of boulders, gravel, sand, and clay), are more than just scenic backdrops. They are a stark, physical reminder of a planet capable of extreme, climate-driven transformation—a scale of change that humbles our current anthropogenic warming, yet underscores the sensitivity of Earth’s systems to temperature shifts.
As the climate warmed and the ice melted, torrents of meltwater surged from the glacier’s face, carrying with it finer sediments. These outwash plains, or sandurs, spread vast blankets of sand and gravel across northern Poland. The Koszalin region sits on this porous, sandy foundation. This geology dictates everything: the fast-draining, often nutrient-poor soils that support distinctive pine forests, and the critical hydrology. The meltwater, trapped by the impermeable clays of the moraines, gave birth to the jewel-like polodowcowe (post-glacial) lakes that dot the area, like the beautiful Lake Jamno to the north. These aquatic ecosystems are direct, delicate legacies of the ice age’s end.
Today, this glacial legacy is not a static museum piece. It is an active participant in 21st-century climate dynamics. The interplay between its geology and a warming world creates a unique set of vulnerabilities and potentialities.
Beyond the sandy plains lie the region’s peatlands, such as those in the surrounding Białogard or Słowiński regions. Formed over millennia in waterlogged conditions, these are among Earth’s most efficient carbon sinks. The waterlogged, anaerobic conditions prevent organic matter from fully decomposing, locking away atmospheric CO2. Koszalin’s geological and hydrological setting helped create these vaults. However, with changing precipitation patterns and increasing temperatures, these waterlogged conditions are at risk. Drained or dried peatlands switch their function from carbon sinks to massive carbon sources, oxidizing and releasing stored greenhouse gases. Thus, the preservation of these geological-hydrological systems transitions from a local conservation issue to a matter of global climate significance. They are a perfect example of a "Nature-based Solution," where protecting a specific local geology directly mitigates a worldwide problem.
The very same sandy aquifers that make the region’s forests picturesque also pose a challenge. Highly permeable soils mean rainwater infiltrates quickly, which is excellent for groundwater recharge but also means contaminants can travel fast. In a climate future predicted to bring more intense rainfall followed by longer dry spells (a pattern already observed in Poland), the management of this hydrological system becomes critical. Will the glacial-era aquifers remain reliable? Or will saltwater intrusion from the nearby Baltic, exacerbated by sea-level rise, or increased pollution from more frequent agricultural runoff, threaten the resource? Koszalin’s water security is a direct function of its Ice Age geology meeting modern climate extremes.
The conversation about climate is not solely about vulnerability; it is also about opportunity. Koszalin’s subsurface holds keys to a sustainable energy transition, albeit with complex trade-offs.
Look at a topographic map, and you’ll see the moraine ridges south of Koszalin. These elevated landforms, a gift from the glacier, now serve a new purpose: they are prime real estate for wind energy. The elevation provides consistently stronger wind flows. The post-glacial landscape, often less densely populated on these hills, presents fewer obstacles. The proliferation of wind farms in West Pomeranian Voivodeship is not a geographical accident; it is a direct harnessing of a glacial topography for post-carbon energy. The very hills pushed up by climate change millennia ago are now helping to fight the modern version of it.
Perhaps the most futuristic synergy lies deeper. Poland, including the Koszalin region, sits on sedimentary basins that hold significant potential for geothermal energy. The concept is simple: use the Earth’s internal heat, a constant and clean source, to warm homes and generate power. For a city like Koszalin, with significant heating needs, tapping into the geothermal gradient could be transformative. It moves energy sourcing from the combustible (coal, gas) to the tectonic, leveraging the planet’s stable geology. While not as visually apparent as a wind turbine on a moraine, exploring and investing in this deep geological resource represents a profound shift from exploiting fossil fuels locked in rocks to utilizing the Earth’s enduring thermal energy.
Standing on Góra Chełmska, a distinct moraine hill with a historic sanctuary, one gets a panoramic view of this geological tapestry. To the north, the Baltic Sea—whose level rose dramatically as those ancient glaciers melted, drowning the old forest and creating the nearby Słowiński National Park with its shifting, monumental dunes. Those dunes themselves are a dynamic geological feature, born from sand supplied by rivers draining the post-glacial landscape, now reshaped by winds. They are a powerful, moving monument to impermanence.
This is the ultimate lesson Koszalin’s geography and geology offer. The landscape itself is a palimpsest of radical climate change. It has seen miles of ice give way to forests, seen sea levels flood coasts, and seen sandy plains become carbon-capturing peat bogs. Its very form is evidence that the planet changes, and life—human and otherwise—adapts or retreats.
The contemporary heat-trapping of our atmosphere is a different, faster mechanism than the orbital cycles of the Pleistocene. But the physical record around Koszalin proves that when the climate shifts, the world is remade from the ground up. The question it poses to us now is not whether the Earth will change—it always has. The question is whether we will listen to the story written in its hills, sands, and bogs, and choose a path of resilience, harnessing the clean energy its geology offers and protecting the fragile systems that stabilize our world. In the quiet, glacial contours of Koszalin’s land, we find a loud and urgent message for our planetary present.