Stopping ice from melting comes down to controlling energy. Ice melts when it absorbs more heat than it can shed, and the primary source of that heat is solar radiation. On a glacier, net radiation accounts for roughly two-thirds of the energy driving melt, with temperature, humidity, and albedo (surface reflectivity) playing supporting roles. Whether you are trying to keep a cooler of ice solid on a camping trip or preserve an entire ice sheet, the physics is the same: reduce the energy reaching the ice, increase its ability to reflect or shed that energy, or physically add more frozen mass. The scale of the challenge varies enormously, though, and what works for a picnic cooler barely scratches the surface of what scientists are testing at the planetary level.
Why Ice Melts in the First Place
Ice is stable below 0 °C, but even at sub-freezing air temperatures, sunlight alone can push a surface past its melting point. Research on Antarctic glaciers has shown that surface melt can occur during sub-freezing air temperatures when solar radiation is strong enough and wind speed is low, allowing heat to concentrate at the surface rather than being carried away by turbulence.1Journal of Geophysical Research: Earth Surface. Surface energy balance and melt thresholds over 11 years at Taylor Glacier, Antarctica That finding underscores an important point: air temperature is not the whole story. The energy arriving at an ice surface is a mix of incoming shortwave radiation from the sun, longwave radiation from the atmosphere, and smaller contributions from sensible heat (warm air touching ice) and latent heat (moisture-related energy exchange).
Studies of glaciers in central Asia illustrate this balance in concrete terms. Net shortwave radiation (sunlight absorbed minus sunlight reflected) supplies the majority of melt energy, while net longwave radiation actually represents a loss of heat from the glacier surface. The overall net radiation accounted for about two-thirds of the total energy available for melt.2Journal of Hydrology: Regional Studies. Energy and mass balance of glaciers in the Ulugh Muztagh driven by climate warming over 44 years Sensible and latent heat fluxes together made up most of the remaining third, but their influence was comparatively minor. This is why so many strategies for slowing ice loss focus on the same lever: reducing how much sunlight the ice absorbs.
Albedo and the Feedback Loop That Accelerates Melt
Albedo, the fraction of sunlight a surface reflects, is the single most powerful variable in ice survival. Fresh snow reflects up to 90 percent of incoming solar radiation; dirty glacier ice may reflect less than half. When ice melts, it exposes darker surfaces underneath, whether rock, soil, or ocean water, which absorb more energy and warm up, accelerating further melt. This self-reinforcing cycle is known as the ice-albedo feedback, and climate models treat it as one of the most important destabilizing processes for surface temperatures on Earth.3PubMed Central. The dependence of the ice-albedo feedback on atmospheric properties
On a Canadian Rocky Mountain glacier, researchers found that summer melt was most sensitive to variations in temperature and albedo, with feedbacks between the two roughly doubling the melt response to a given temperature increase.4The Cryosphere. Surface energy balance sensitivity to meteorological variability on Haig Glacier, Canadian Rocky Mountains In plain terms, a small rise in temperature darkens the surface (by melting reflective snow and exposing older ice), and that darker surface then absorbs even more heat, producing melt well beyond what the temperature increase alone would cause. Breaking this feedback loop is the goal behind many of the interventions discussed below.
Covering Ice With Reflective Materials
One of the most straightforward approaches is literally draping something reflective over the ice. At ski resorts and on retreating glaciers across the Alps, crews have been laying white geotextile blankets over vulnerable ice surfaces for years. These non-woven fabrics can reduce snow and ice melt by up to 69 percent compared with uncovered surfaces, mainly by boosting albedo by about 50 percent relative to bare ice.5Cold Regions Science and Technology. The non-woven geotextiles as strategies for mitigating the impacts of climate change on glaciers A separate modeling study found that geotextile covers could decrease ice melt by up to 1,000 millimeters of water equivalent, driven primarily by a 23 percent increase in albedo compared to uncovered ice.6Advances in Climate Change Research. Assessing the impact of artificial geotextile covers on glacier mass balance and energy fluxes
This works well on a ski run or a small glacier tongue, but it is impractical at the scale of an entire ice sheet. The logistics of manufacturing, transporting, and maintaining fabric across thousands of square kilometers of remote, moving ice are staggering. Geotextile coverage remains a useful local tool, not a planetary solution.
A more ambitious version of the same idea involves spreading tiny reflective hollow glass microspheres over Arctic sea ice. The concept is to raise the ice’s albedo enough to slow the ice-albedo feedback and give more ice a chance to survive the summer melt season.7Earth’s Future. Application of Hollow Glass Microspheres in the Arctic Ocean Would Likely Lead to a Deceleration of Arctic Sea Ice Loss” ‐ A Critique of the Paper by Webster and Warren (2022) Early research suggests the approach can slow sea ice loss, though modeling the fate of billions of tiny glass particles on a shifting, cracking, melting surface is far from simple.8PubMed. Modelling the fate of Hollow Glass Microspheres deployed for Arctic sea ice albedo modification And the results are contested: one modeling study found that under certain conditions, glass microspheres could actually accelerate ice loss rather than slow it, because the particles can end up in the ocean after ice breaks up, darkening the water surface rather than brightening the ice.9Earth’s Future. Regional Geoengineering Using Tiny Glass Bubbles Would Accelerate the Loss of Arctic Sea Ice The disagreement in the literature highlights how sensitive these interventions are to details of timing, location, and scale.
Brightening Clouds and Dimming Sunlight
If you cannot cover all the ice, you can try to reduce the sunlight reaching it in the first place. Two broad strategies fall under this umbrella: stratospheric aerosol injection and marine cloud brightening.
Stratospheric aerosol injection involves releasing reflective particles, usually sulfur-based compounds, into the upper atmosphere to scatter incoming sunlight before it reaches the surface. Climate model simulations show that Arctic-focused injection strategies can maintain or restore September sea ice to within about 10 percent of a target level, reduce permafrost thaw, and increase the surface mass balance of the Greenland Ice Sheet by cutting runoff.10Earth’s Future. High‐Latitude Stratospheric Aerosol Injection to Preserve the Arctic Similar modeling for Antarctica has found that injection strategies could slow ice loss there as well, though the results depend heavily on where in the atmosphere the particles are released. Injecting only in the Northern Hemisphere or at the equator can actually warm Antarctic shelf oceans, worsening ice loss rather than preventing it.11Journal of Geophysical Research: Atmospheres. Stratospheric Aerosol Injection Can Reduce Risks to Antarctic Ice Loss Depending on Injection Location and Amount The lesson here is that these strategies are not simply a thermostat you can turn down globally; where and how you intervene matters enormously.
Marine cloud brightening takes a different approach. Instead of injecting particles into the stratosphere, it sprays sea salt aerosols into low-lying marine clouds to make them more reflective. Model simulations have shown that brightening clouds near polar regions can recover much of the winter sea ice extent lost under climate warming scenarios, extending the ice edge significantly in some ocean basins.12PubMed Central. Marine cloud brightening: regional applications The technique is less dramatic than stratospheric injection and theoretically more reversible, since sea salt particles wash out of the atmosphere within days. But it requires continuous deployment and faces its own set of unknowns about how cloud systems will respond over time.
Making Ice Thicker Before Summer Arrives
Rather than reducing melt, another family of proposals tries to build more ice than summer can destroy. The most-studied version involves pumping seawater onto the surface of existing Arctic sea ice during winter. The idea is that the water infiltrates the snow layer, forms slush, and freezes in the cold air, directly thickening the ice. The loss of insulating snow also allows more heat to escape from the ocean through the ice, promoting additional freezing on the underside.13Earth’s Future. Arctic Sea Ice Response to Flooding of the Snow Layer in Future Warming Scenarios Modeling suggests that this approach is most effective when flooding begins early in the ice growth season, giving the slush time to freeze solid before temperatures rise.
Field observations have started to test whether the theory holds up in practice. Early trials used wind-driven pumps to move seawater onto ice surfaces, allowing it to freeze at the surface through exposure to cold air.14Journal of Geophysical Research: Oceans. Field Observations of Sea Ice Thickening by Artificial Flooding Coupled climate model experiments simulating the physical effect of large numbers of such pumps have confirmed that the approach can delay Arctic sea ice decline, though it would not halt global warming itself.15Earth’s Future. Sea Ice Targeted Geoengineering Can Delay Arctic Sea Ice Decline but not Global Warming The distinction is important: thickening ice buys time, but it does nothing to address the underlying buildup of greenhouse gases.
Blocking Warm Water From Below
Some of the most vulnerable ice on the planet is being eaten away not from above but from below. In West Antarctica, warm ocean currents flow beneath floating ice shelves and erode them from underneath, weakening the buttresses that hold back land-based glaciers. If those shelves thin or collapse, the glaciers behind them accelerate into the ocean and raise sea levels. One proposed countermeasure is installing underwater curtains: thin, flexible, buoyant barriers anchored to the seabed that would redirect or block deep warm water from reaching the base of critical ice shelves.16PubMed Central. The potential for stabilizing Amundsen Sea glaciers via underwater curtains
A more extreme version of this idea involves artificially adding mass to ice sheets from above. One simulation showed that depositing a minimum of 7,400 gigatons of additional snowfall onto coastal regions around Pine Island and Thwaites glaciers over a decade could stabilize the West Antarctic Ice Sheet, potentially preventing a self-sustaining collapse that would raise sea levels by more than three meters.17PubMed Central. Stabilizing the West Antarctic Ice Sheet by surface mass deposition The sheer volume of water that would need to be desalinated, heated to snowfall temperatures, and distributed across the ice sheet makes this a thought experiment more than a near-term proposal, but it illustrates the scale of the problem.
An Ecological Approach to Protecting Permafrost
Not all frozen ground is ice sheets and glaciers. Permafrost, the perennially frozen soil underlying vast areas of the Arctic, stores enormous quantities of carbon that would accelerate warming if released. Here, an unexpected strategy has emerged from ecology rather than engineering: increasing the density of large herbivores.
The reasoning goes like this. In winter, deep, fluffy snow acts as an insulating blanket, keeping the ground relatively warm even when air temperatures plunge far below zero. Large animals like bison, horses, and reindeer trample that snow flat, compressing it and dramatically reducing its insulating effect. The compacted snow allows winter cold to penetrate deeper into the soil, keeping the permafrost colder year-round. Model simulations suggest that increasing herbivore density across northern ecosystems could keep about 80 percent of current permafrost areas intact through the end of the century, even under a high-warming scenario, with average permafrost temperatures remaining below −4 °C.18PubMed Central. Protection of Permafrost Soils from Thawing by Increasing Herbivore Density Without the herbivore effect, permafrost area loss was projected at 631 million hectares; with it, the loss dropped to 233 million hectares.
Field observations in northeastern Siberia support the modeling. Intensively grazed areas showed shallower thaw depth and higher carbon storage compared with non-grazed sites in the same landscape, consistent with a more stable thermal regime in the ground.19Frontiers in Environmental Science. Large herbivores on permafrost— a pilot study of grazing impacts on permafrost soil carbon storage in northeastern Siberia The approach is not going to save a glacier, but for the vast stretches of Arctic permafrost that are quietly warming and releasing methane, it represents one of the few interventions that could be deployed relatively cheaply and with existing biological populations.
Why Scale and Governance Are the Real Obstacles
Almost every technique described above has shown promise in models or small-scale trials. The recurring problem is not physics; it is scale, cost, and politics. A comprehensive review of glacier and ice sheet geoengineering found that while these technologies can reduce melt, challenges related to environmental risks, ethical questions, and technical feasibility constrain their broader application.20PubMed. Mitigating ice sheets and mountain glaciers melt with geoengineering
Consider the power requirements alone. Proposals to remove meltwater from beneath glaciers to slow their sliding (a theoretically sound approach, since draining subglacial water can reduce glacier velocity by more than 50 percent21The Cryosphere. Reduced glacier sliding caused by persistent drainage from a subglacial lake) would require multiple megawatts of power in some of the most remote locations on Earth. Solar farms are impractical during the polar winter. Wind turbines at the necessary scale on moving ice do not exist. And nuclear power in Antarctica would clash with the Antarctic Treaty.22Frontiers in Science. Safeguarding the polar regions from dangerous geoengineering: a critical assessment of proposed concepts and future prospects – Section: Proposed concept 4: Slowing ice sheet flow through basal water removal
Stratospheric aerosol injection carries its own geopolitical risks. Using it to preferentially cool one polar region could shift global rainfall patterns, potentially disrupting the monsoon systems that billions of people depend on for water and food.23Frontiers in Science. Safeguarding the polar regions from dangerous geoengineering: a critical assessment of proposed concepts and future prospects – Section: Proposed concept 1: Stratospheric aerosol injection And installing large physical structures like underwater curtains in Antarctic waters would require environmental evaluations and international consensus on a scale that has never been attempted under the Antarctic Treaty System. Governance experts have warned that such proposals risk political fragmentation and “international discord” among treaty nations.24Frontiers in Science. Safeguarding the polar regions from dangerous geoengineering: a critical assessment of proposed concepts and future prospects – Section: Proposed concept 2: Sea curtains/sea walls
Indigenous communities in the Arctic, whose lands and livelihoods would be directly affected by many of these interventions, have largely been absent from the decision-making process. Researchers have called for engagement models that adhere to the United Nations Declaration on the Rights of Indigenous Peoples and actively incorporate Indigenous knowledge on climate stewardship.25Energy Research & Social Science. An Indigenous perspective on climate engineering Any real-world deployment of ice-preservation geoengineering would need to clear not just technical hurdles, but social and legal ones that are arguably harder.
What Volcanoes Tell Us About the Limits of Cooling
Nature has run its own experiments in stopping ice from melting. The onset of the Little Ice Age, roughly 700 years ago, has been linked to an unusual 50-year stretch with four large sulfur-rich volcanic eruptions, each injecting massive quantities of sulfate aerosols into the atmosphere. Climate model simulations show that the explosive volcanism produced abrupt summer cooling, and that cold summers were then maintained by sea-ice and ocean feedbacks long after the volcanic aerosols had cleared.26Geophysical Research Letters. Abrupt onset of the Little Ice Age triggered by volcanism and sustained by sea‐ice/ocean feedbacks
This is both encouraging and cautionary. It shows that if you darken the skies enough, ice can indeed grow and sustain itself through feedback loops. But the Little Ice Age also brought crop failures, famine, and social upheaval across Europe and beyond. A sustained period of reduced sunlight is not a cost-free lever. The volcanic record makes clear that the ice-albedo feedback can be a powerful stabilizing force once it gets going, but triggering it intentionally, without the catastrophic side effects that accompany a major eruption, is the challenge no one has solved yet.
Everyday Ice Preservation and What the Science Shares With It
The grand-scale interventions get the headlines, but the underlying physics applies at every scale. When you wrap a cooler in a reflective emergency blanket, you are reducing radiative heat transfer, the same mechanism that makes geotextile covers work on glaciers. When you pack ice in sawdust (a centuries-old technique for storing ice harvested from frozen lakes), you are adding insulation to cut conductive and convective heat flow. Pre-chilling the container, minimizing how often you open it, and filling dead space all reduce the temperature gradient between the ice and its environment, slowing the rate of energy transfer.
Vacuum-insulated containers take this further by nearly eliminating conduction and convection, leaving radiation as the only significant pathway for heat to reach the ice. In principle, the best you can do without active refrigeration is surround the ice with a perfect vacuum and a perfectly reflective surface. In practice, every container leaks heat somewhere, and the ice eventually melts. The same is true at the planetary scale: even the most ambitious geoengineering proposals are buying time against an energy imbalance, not eliminating it. The ice will keep melting as long as the climate system holds more energy than it can shed, and right now the accumulation of greenhouse gases ensures that it does.