What Are Germany’s Most Pressing Environmental Problems?

Germany faces a constellation of environmental problems that go well beyond the carbon emissions most people associate with Europe’s largest industrial economy. Drained peatlands alone account for roughly 7.5 percent of the country’s total greenhouse gas output, forests in entire mountain ranges have collapsed from bark-beetle infestations, and rivers have suffered catastrophic fish kills from toxic algal blooms. Some of these crises are shared with neighboring countries; others are distinctly German, rooted in the country’s industrial history, its intensive agriculture, and its particular geology.

Peatlands Turned into Carbon Bombs

One of Germany’s most underappreciated environmental liabilities sits in its drained peatlands. Over centuries, peatlands across northern Germany were drained for agriculture and peat extraction. Once saturated with water, peat stores enormous quantities of carbon. Drain it, and that carbon starts oxidizing into the atmosphere. The result is striking: drained peatland contributes about 7.5 percent of Germany’s total national greenhouse gas emissions, a share large enough that the German government adopted a National Peatland Protection Strategy in 2022 to begin addressing it.¹

The proposed fix is rewetting, essentially flooding the peatlands again so the decomposition stops. Research shows that rewetting produces a net climate benefit even though reflooded peat releases methane, a potent greenhouse gas in the short term. Because methane breaks down in the atmosphere relatively quickly compared to CO₂, and because rewetted peatlands stop releasing CO₂ and nitrous oxide almost immediately, the overall warming effect peaks and then declines. The modeling suggests peatlands should be rewetted as soon as possible to maximize the cooling effect during the period of peak global warming expected in the second half of this century.²

The difficulty is practical. Much of the drained peatland is productive farmland, and rewetting it means taking it out of agricultural use. Economic modeling suggests the transition will carry real costs for the farming sector, which is why the debate over how fast and how far to go remains unresolved.

Forests in Collapse

Germany’s forests are in visible crisis, and the damage is concentrated in spruce-dominated regions. In the Harz Mountains National Park, Norway spruce has experienced mortality exceeding 97 percent in study stands due to infestation by the European spruce bark beetle.³ That figure is not a typo. Virtually every spruce tree in large sections of the Harz is dead or dying.

The bark beetle is native to Europe and has always been part of forest ecosystems, but the scale of current outbreaks is tied to climate. Extended droughts in 2018, 2019, and 2020 weakened trees across central Germany, reducing their ability to produce the resin that normally repels boring insects. Warmer temperatures also let bark beetles complete more reproductive cycles in a single year, multiplying populations faster than the trees can cope. The Harz is the most dramatic case, but similar die-offs have hit spruce stands in the Thuringian Forest, the Sauerland, and parts of Bavaria.

The ecological consequences extend beyond the trees themselves. Spruce forests were monocultures planted for timber, so their loss opens up debate about what should replace them. Foresters are increasingly planting mixed stands with beech, oak, and other broadleaf species better adapted to warming conditions, but a newly planted forest takes decades to mature. In the meantime, the dead stands change local water cycles, increase erosion on steep slopes, and alter habitat for everything from birds to fungi.

Disappearing Insects

Germany became the center of global attention on insect decline after a widely discussed long-term study documented steep drops in flying-insect biomass in nature reserves. The causes are still debated, but one of the most thorough analyses of the German situation points toward landscape and land-management changes over the past three decades as the primary driver. While the toxic load from pesticide application has actually decreased over that period, shifts in land use driven by market pressures and EU agricultural policy have reduced the availability and suitability of insect habitat.⁴

That finding complicates the narrative. Banning certain pesticides, while potentially helpful, would not reverse the structural changes in the landscape: the loss of hedgerows, the conversion of flower-rich meadows to intensive cropland, the drainage of wet grasslands, and the increasing uniformity of agricultural fields. These changes were often driven by subsidy structures that rewarded maximizing production per hectare, creating an agricultural landscape that is efficient for farming but hostile to the small creatures that pollinate crops and sustain food webs.

Groundwater Under Pressure

Germany is not a country most people associate with water scarcity, but recurring droughts since 2018 have exposed real vulnerabilities. An analysis of groundwater conflicts across the country over more than two decades identified four persistent clusters where demand for groundwater repeatedly outstrips supply: eastern Germany (the largest cluster, spanning 29 districts), the Rhine River Valley near the Dutch border, the greater Frankfurt area, and southwestern Germany along the Upper Rhine.⁵

Eastern Germany’s problems are partly structural. The region receives less rainfall than the west, and its sandy soils retain less moisture. Add agricultural irrigation demands, industrial water use, and the lingering effects of lignite mining, which historically lowered water tables across huge areas, and you get a region where groundwater stress is chronic rather than occasional. Still, the study found that about two-thirds of German districts experienced a groundwater conflict hotspot only once or not at all over the study period, meaning the problem is geographically concentrated rather than nationwide. That concentration makes it politically tricky: the regions under the most pressure are often the ones with the least economic clout to push for infrastructure investment.

Rivers Under Toxic Stress

The Oder River disaster of 2022 was a vivid illustration of how vulnerable German waterways remain. During the summer, a massive toxic algal bloom of the golden alga Prymnesium parvum devastated the river, which forms much of the border between Germany and Poland.⁶ The bloom killed fish along hundreds of kilometers of river. Investigations pointed to high nutrient concentrations and permanently saline water, both conditions that favor Prymnesium growth. The salinity was linked partly to industrial discharges upstream in Poland, and the toxins the algae produced had not been previously recorded in Polish waters.⁷

The Oder is not an isolated case. Germany’s rivers carry a substantial load of microplastic contamination. Research on the Rhine documented concentrations as high as roughly 11,000 particles per liter, and the Weser River showed similarly heavy contamination.⁸ These particles come from a mix of sources: tire wear, synthetic clothing fibers, degraded packaging, and industrial pellets. They persist in sediment, enter drinking water systems, and accumulate in the tissues of aquatic organisms. Wastewater treatment plants remove a large share, but significant quantities still pass through.

Forever Chemicals in Drinking Water

Per- and polyfluoroalkyl substances, the so-called “forever chemicals” or PFAS, represent a slow-moving but serious contamination problem in Germany. These synthetic compounds resist breakdown in the environment, accumulate in organisms, and some are toxic even at very low concentrations. Several contamination incidents have been documented in drinking water sources across North Rhine-Westphalia, including one case in Arnsberg where PFOA concentrations in drinking water reached up to 0.64 micrograms per liter, prompting the German Drinking Water Commission to set a health-based guide value for lifetime exposure in 2006.⁹

The problem extends beyond dramatic spills. A nationwide screening of German drinking water for 26 PFAS compounds found that while all samples fell below the regulatory limit for the sum of 20 PFAS, concentrations varied widely, reaching up to about 80 nanograms per liter in some locations. Two samples exceeded the stricter threshold for the four most-watched PFAS compounds combined.¹⁰ Because much of Germany’s drinking water comes from groundwater, and because some PFAS move easily through soil into aquifers, thresholds for safe drinking water are sometimes already exceeded by ambient environmental concentrations.¹¹

Germany has been relatively proactive in setting PFAS thresholds, but the challenge is remediation. PFAS contamination of groundwater is effectively permanent without active treatment, and the sources are diffuse: firefighting foams used at military bases and airports, industrial coatings, even the sludge from wastewater treatment spread on agricultural fields. Containing existing contamination while preventing new inputs is an open-ended regulatory struggle.

Soil Sealing and the Loss of Farmland

Every day, about 55 hectares of soil in Germany are damaged by development, and between 2006 and 2015, roughly 73,300 hectares of land were sealed with asphalt, concrete, and buildings. Of that, about 37,000 hectares were agricultural soils, sealed at a rate of roughly 11 hectares per day across the country.¹² Sealed soil cannot absorb rain, grow crops, store carbon, or support the microbial communities that cycle nutrients. The losses are essentially permanent on any human timescale.

The rate of soil sealing has been a political issue for over two decades. Germany set a target to reduce it to 30 hectares per day by 2020, and while the rate has declined from its peak, the target was missed. The consequences ripple outward: sealed surfaces amplify urban flooding during heavy rain events, worsen the urban heat island effect, and push agriculture onto more marginal soils elsewhere. Lower Saxony and Brandenburg, two states with substantial agricultural economies, have been losing farmland at rates of nearly 2 and about 0.8 hectares per day respectively.

The Lignite Mining Legacy

Germany remains Europe’s largest producer of lignite, the soft brown coal that is the dirtiest fossil fuel in common use. The mining footprint in two major regions, the Rhineland in the west and Lusatia in the east, has radically reshaped entire landscapes. Villages have been relocated, aquifers disrupted, and thousands of hectares stripped down to bedrock. With the planned phase-out of coal, presumably within the next decade, both regions face enormous transformation as mining ceases and the question of what to do with the land becomes urgent.¹³

Post-mining landscapes are not simply empty fields waiting to be replanted. The pit lakes that form when mining ceases can be acidic, the soils are often nutrient-poor or contaminated, and the hydrology of the surrounding area has been fundamentally altered. Lusatia in particular faces a double challenge: it is already in the driest part of Germany, and the end of mining means the pumping that currently manages water levels will stop, potentially flooding some areas while leaving others drier than before. These landscapes will be in ecological recovery for generations.

Munitions on the Seafloor

An environmental hazard unique to Germany’s coastal waters is the estimated 300,000 tons of relic munitions sitting on the floor of the German Baltic Sea, a legacy of two world wars and post-war dumping. These corroding shells and bombs are leaching explosive compounds into the water column. Research in the southwestern Baltic found at least one munitions-related chemical in nearly every water sample collected, with TNT levels especially high in Kiel Bay and RDX and DNB concentrations peaking in Lübeck Bay. The total inventory of dissolved munitions chemicals in the study area was roughly 3,000 kilograms, and at current corrosion rates, the existing munitions could sustain those contamination levels continuously for over 800 years.¹⁴

That last number is particularly sobering. This is not a contamination event that will flush through the system and dissipate. The munitions are a slow-release source that will continue emitting toxic compounds for centuries unless physically removed. TNT and its breakdown products are toxic to marine organisms, and the compounds can bioaccumulate. Germany and its Baltic neighbors have begun pilot programs for munitions retrieval, but the scale of the problem, both in tonnage and in the technical difficulty of handling unstable old ordnance underwater, makes any comprehensive cleanup a generational project.

Heat, Noise, and the Urban Burden

Germany’s cities face growing pressure from extreme heat. The urban heat island effect, where built-up areas trap and radiate heat far more than surrounding countryside, has become a public health concern as heat waves grow more frequent and intense. Research into German cities found that while the health risks from heat are well recognized, implementation of heat health action plans varies widely, and many cities lack comprehensive strategies to protect residents.¹⁵ Elderly residents, people with chronic illnesses, and those in densely built neighborhoods without green space or air conditioning are most vulnerable.

Less discussed but also consequential is the chronic burden of traffic noise. Road traffic noise above 40 decibels over a 24-hour average, a level exceeded across large parts of German urban areas, is associated with cardiovascular disease, depressive disorders, sleep disturbance, and general annoyance. A detailed burden-of-disease study in the state of Hesse calculated the disability-adjusted life years attributable to road noise using dose-response relationships established in large German and WHO studies, finding measurable health impacts from hypertensive heart disease, ischemic heart disease, stroke, and depression linked to noise exposure.¹⁶ Unlike air pollution, which gets headline attention, noise exposure is so constant and familiar that people tend to dismiss it as merely annoying rather than harmful. The epidemiological evidence says otherwise.

Nuclear Waste Without a Home

Germany shut down its last nuclear power plants in 2023, but the waste they produced will remain radioactive for tens of thousands of years. The country has been searching for a permanent deep geological repository since the 1970s and has yet to settle on a site. In 2020, 90 areas with favorable geological conditions were identified as potential candidates in the first phase of a formal site selection process.¹⁷ The next step involves preliminary safety analyses and surface-based exploration, but the models used to predict how a repository will perform over geological timescales carry substantial uncertainties. The selection process is expected to continue well into the 2040s or beyond.

The political dimension is as challenging as the technical one. Every proposed site encounters fierce local opposition, and the legacy of the Gorleben salt dome, which was selected for political rather than geological reasons and became a symbol of anti-nuclear activism, has made the public deeply skeptical of the process. Germany’s high-level waste is currently stored in interim facilities at various locations, a solution explicitly designed to be temporary but one that may persist for decades longer than intended.