The global polar bear population is not increasing in any sustained, documented way. The best available science puts the total number somewhere around 23,000 to 26,000 bears spread across 19 recognized subpopulations in the Arctic, and the overall trajectory points toward decline as sea ice disappears. But the picture is more complicated than a single trend line, because polar bear populations are not one unified group. Some subpopulations have remained stable or even grown in recent years, while others have dropped sharply, and several are so poorly monitored that scientists can only guess at what is happening.
What the Global Numbers Actually Show
Polar bears live across a vast stretch of the circumpolar Arctic, from Canada and Alaska through Norway, Greenland, and Russia. Scientists divide them into 19 subpopulations, each occupying a distinct range with its own ice dynamics and ecological conditions. A 2018 assessment estimated the global population at roughly 23,300 bears, with a wide range of uncertainty from about 16,000 to 31,000.1Animal Conservation. Assessment of global polar bear abundance and vulnerability An earlier analysis used a round figure of approximately 26,000.2PubMed Central. Conservation status of polar bears (Ursus maritimus) in relation to projected sea-ice declines Neither number represents a precise census. Only 14 of the 19 subpopulations even have population estimates, and outside a handful of well-studied groups, the average gap between consecutive surveys has been nearly 11 years.1Animal Conservation. Assessment of global polar bear abundance and vulnerability Some subpopulations have not been surveyed in over three decades. That enormous data gap is one reason claims about global trends, whether up or down, should be treated with caution.
The IUCN Red List classifies polar bears as “vulnerable,” meaning a meaningful probability of population decline over the coming decades. The estimated probability that the global population will shrink by more than 30 percent within roughly 35 to 41 years (three polar bear generations) is about 71 percent, though some models put it as low as 20 percent and others as high as 95 percent depending on future ice loss.2PubMed Central. Conservation status of polar bears (Ursus maritimus) in relation to projected sea-ice declines The odds of a catastrophic 80 percent crash are very low. The concern is not imminent extinction but a grinding, steady reduction tied to habitat loss.
Where Populations Have Declined
The clearest declines are in subpopulations where sea ice breaks up earlier each spring and returns later each autumn, forcing bears onto land for longer periods without access to their main prey. Western Hudson Bay is the most studied example. This subpopulation dropped from about 1,194 bears in 1987 to 935 in 2004, with survival of younger and older bears closely tracking the timing of spring ice breakup.3The Journal of Wildlife Management. Effects of Earlier Sea Ice Breakup on Survival and Population Size of Polar Bears in Western Hudson Bay A longer-term analysis using data through 2011 found the decline continued, reaching about 806 bears.4PubMed. Demography of an apex predator at the edge of its range: impacts of changing sea ice on polar bears in Hudson Bay By 2004, spring breakup was occurring roughly three weeks earlier than it had in 1984.
Alaska’s Southern Beaufort Sea subpopulation tells a similar story. Between 2004 and 2006, survival plummeted and abundance dropped by 25 to 50 percent.5PubMed. Polar bear population dynamics in the southern Beaufort Sea during a period of sea ice decline Adult and cub survival improved somewhat after 2007, and the population stabilized for a few years around 900 bears. But a longer study through 2015 found that abundance fluctuated around an average of just 565 bears after the initial crash, lower than at any point since the U.S. Marine Mammal Protection Act took effect in 1972.6PubMed Central. Survival and abundance of polar bears in Alaska’s Beaufort Sea, 2001-2016 Subadult survival declined throughout the entire period, even when things improved for other age classes. This kind of selective pressure on younger bears bodes poorly for long-term recovery.
Where Things Look Stable or Better
Not every subpopulation is shrinking. The Kane Basin subpopulation in the high Arctic has shown signs of range expansion, improved body condition, and stable reproduction, with evidence suggesting the population is likely growing.7PubMed. Transient benefits of climate change for a high-Arctic polar bear (Ursus maritimus) subpopulation Researchers attribute this to the shift from thick, multi-year ice to thinner seasonal ice that supports higher biological productivity. When dense, old ice gives way to more dynamic ice, it can temporarily open up better hunting conditions for bears. The study’s authors used the word “transient” deliberately: this benefit depends on there still being seasonal ice in the first place, and continued warming will eventually erode that advantage.
The Chukchi Sea, shared by the U.S. and Russia, has also shown relatively encouraging signs. Aerial surveys produced abundance estimates ranging from about 3,400 to 5,400 bears depending on how many animals were assumed to have been missed during Russian flights.8PubMed Central. Aerial survey estimates of polar bears and their tracks in the Chukchi Sea Polar bears in this region have been fasting less in spring compared to bears in the Beaufort Sea, consistent with higher primary productivity and better prey availability despite ice loss in the area.9PubMed. Spring fasting behavior in a marine apex predator provides an index of ecosystem productivity The Chukchi findings are a reminder that the Arctic is not a uniform landscape. Regional differences in ocean productivity, ice dynamics, and prey abundance create very different conditions for bears even in adjacent seas.
Why the Numbers Are So Hard to Pin Down
Counting polar bears is extraordinarily difficult. They live across millions of square kilometers of remote, inhospitable terrain that includes shifting sea ice, open water, and coastline. Traditional mark-recapture studies, where researchers catch bears, tag them, and then estimate total numbers based on how many tagged bears show up in later samples, have been the backbone of population monitoring for decades. But these studies depend on sampling a representative area, and that does not always happen.
A case study from Western Hudson Bay illustrates the problem well. An aerial survey produced an estimate of about 1,030 bears, similar to the 2004 mark-recapture estimate but higher than model projections that had predicted continued decline. The researchers found large numbers of bears summering in southeastern Hudson Bay, an area that had not been regularly covered by mark-recapture efforts. They concluded that previous estimates may have been negatively biased because of limited spatial sampling, and cautioned that mark-recapture and aerial survey estimates are not directly comparable.10Biological Conservation. Revisiting Western Hudson Bay: Using aerial surveys to update polar bear abundance in a sentinel population This does not necessarily mean the population had not declined, but it demonstrates how changing survey methods can make trends difficult to interpret.
People who claim polar bear numbers are increasing often point to comparisons between today’s estimates and rough figures from the 1960s and 1970s, when unrestricted hunting was devastating bear populations across the Arctic. International protections adopted in the 1970s curtailed commercial and sport hunting in most regions, and several subpopulations did recover. But those historic lows are not a meaningful baseline for evaluating whether bears are thriving today. A population rebounding from severe overhunting can still be headed toward trouble from an entirely different threat.
Sea Ice Loss and How It Hits Bears
Polar bears are ice-obligate predators. They hunt primarily by waiting at breathing holes or at the edges of leads in the ice, ambushing ringed seals and other marine mammals. When the ice platform disappears earlier in spring and forms later in autumn, the hunting season shrinks. Bears are forced either to swim longer distances to reach receding ice or to come ashore where food options are extremely limited.
The energetic consequences of this are severe. Polar bears on the ice in the Beaufort Sea now roam home ranges that are about 64 percent larger than they were in earlier decades, driven by the expansion of open water and the retreat of preferred ice habitat.11Ecosphere. Effects of sea ice decline and summer land use on polar bear home range size in the Beaufort Sea Traveling farther to find the same prey burns more calories. In the Chukchi Sea, polar bear habitat selection has not changed, meaning bears still seek the same type of ice they always have, but summer availability of that highly selected habitat has dropped by about 75 percent.12PubMed Central. Invariant polar bear habitat selection during a period of sea ice loss Bears want what they have always wanted; there is just less of it.
During fasting periods on land, polar bears reduce their activity and lower their body temperature gradually, but these adjustments offer only limited energy savings compared to a true hibernation strategy. Researchers tracking bears with GPS collars and temperature loggers found that both shore-based and ice-based bears showed the gradual metabolic decline typical of fasting mammals, not the deep shutdown seen in hibernators, making them vulnerable to deteriorating body condition as the ice-free season lengthens.13PubMed. Summer declines in activity and body temperature offer polar bears limited energy savings Modeling work suggests that most bears in reasonable condition can survive a 120-day fast under current conditions, but if that fasting window stretches to 180 days, mortality among adult males could reach around 18 percent, with the poorest-condition individuals dying first.14PubMed Central. Simulating polar bear energetics during a seasonal fast using a mechanistic model
What Happens to Reproduction
Population growth ultimately depends on whether females can produce and raise cubs, and this is where sea ice loss bites hardest. In the Southern Beaufort Sea, breeding rates and cub litter survival have declined as the ice-free season has lengthened.15PubMed. Survival and breeding of polar bears in the southern Beaufort Sea in relation to sea ice Long-term data from the same region shows reduced litter mass and fewer yearlings per female in years with less optimal sea ice habitat, pointing to nutritional limitations that affect both body size and reproductive output.16PubMed. Reduced body size and cub recruitment in polar bears associated with sea ice decline
Female polar bears need to accumulate substantial fat reserves before denning. If the feeding season is cut short by early ice breakup, mothers enter dens lighter, produce smaller cubs, and are less likely to successfully nurse them through the winter. Even a modest shift in the timing of ice can cascade through the reproductive cycle. Modeling of the Lancaster Sound population predicts that female mating success could drop from 99 percent to as low as 72 percent if habitat fragmentation causes searching efficiency to decline much faster than ice area itself, because males and females have a harder time finding each other on a fractured, shrinking platform.17Biological Conservation. Predicting survival, reproduction and abundance of polar bears under climate change
Shifting Diets and the Seal Problem
As ice disappears, the spatial overlap between polar bears and their primary prey, ringed seals, decreases. In Svalbard, researchers found that polar bears and ringed seals still overlapped near tidal glacier fronts in spring, but by summer and autumn the overlap had dropped substantially. Bears were traveling farther daily and spending more time near ground-nesting bird colonies, where they raided eggs and chicks instead.18PubMed. An Arctic predator-prey system in flux: climate change impacts on coastal space use by polar bears and ringed seals This is sometimes cited by optimists as evidence that polar bears are adaptable, and they are. But bird eggs and terrestrial food sources contain a fraction of the caloric punch of a 60-kilogram ringed seal. A bear raiding goose nests is burning more energy getting there than it gains from eating eggs. These behavioral shifts are better understood as desperation moves than adaptive triumphs.
In the Beaufort Sea, spring fasting among bears has increased between earlier and more recent decades, and the trend tracks with declining body condition of ringed seals in the same area. Fasting status was assessed through blood chemistry, with bears classified as fasting if they had gone at least seven days without eating. Meanwhile, in the adjacent Chukchi Sea, fasting declined between the same time periods and was less common overall, consistent with higher primary productivity sustaining the prey base despite ice loss.9PubMed. Spring fasting behavior in a marine apex predator provides an index of ecosystem productivity The two seas sit side by side, yet the bears in them are living dramatically different lives. This is the kind of variation that makes sweeping claims about polar bear trends, positive or negative, misleading.
More Bears in Town Does Not Mean More Bears Overall
One reason the “polar bears are increasing” narrative persists is that people in Arctic communities report seeing more bears near towns and settlements. In Churchill, Manitoba, the number of bears involved in human conflicts has risen as the ice-free season has grown longer. Bears that would normally be out on the ice hunting seals are instead stuck on shore, hungry, and more willing to approach human food sources.19Global Ecology and Conservation. Temporal dynamics of human-polar bear conflicts in Churchill, Manitoba This gives the understandable impression that there are more bears. In fact, it reflects the opposite: bears pushed onto land by shrinking ice are concentrated into a smaller area and behaving more boldly because they are nutritionally stressed.
The pattern is broadly consistent across the Arctic. Polar bears are increasingly using land during summer and autumn due to sea ice loss, which leads to more frequent encounters with people and higher incidents of conflict.20Biological Conservation. Relative influences of climate change and human activity on the onshore distribution of polar bears For Indigenous communities that have lived alongside bears for generations, the lived experience of “there are bears everywhere” is real and valid, but it reflects a change in distribution, not abundance. A shrinking population can become more visible if its habitat shrinks even faster.
Genetic Diversity and Whether Bears Can Adapt
Could polar bears evolve their way out of this? The short answer is that evolution works on timescales far longer than the current pace of ice loss. Warming has already led to reduced genetic variation in some subpopulations, though not all, and evidence of adaptive genetic change in response to the new conditions remains limited.21Ecological Monographs. Climate‐linked evolution and genetics in a warming Arctic Bears are showing behavioral and seasonal flexibility, such as shifting their timing of movements or spending more time on land, but flexibility in behavior is not the same as genetic adaptation. It is more like a coping mechanism that has limits. A bear can change what it eats when seals are unavailable; it cannot change how much energy it needs to survive a six-month fast.
Reduced genetic diversity is particularly concerning for small, isolated subpopulations. When populations shrink and become cut off from others, inbreeding increases and the gene pool narrows, which reduces a population’s ability to respond to new diseases, environmental shifts, or other stressors. This genetic erosion happens quietly and does not show up in population counts until it is already advanced.
What Projections Say About Coming Decades
Multiple modeling studies have linked polar bear demographic rates to projected sea ice trajectories, and the results are consistently sobering. Stochastic population models driven by climate projections under a business-as-usual emissions scenario show drastic declines by the end of this century.22PubMed. Climate change threatens polar bear populations: a stochastic demographic analysis A separate energetics model estimated that if the summer fasting period in Western Hudson Bay extends from the current roughly 120 days to 180 days, somewhere between 28 and 48 percent of adult males could die of starvation. The relationship between fasting period and mortality is not linear but sigmoid, meaning things look manageable for a while and then deteriorate rapidly once a threshold is crossed.17Biological Conservation. Predicting survival, reproduction and abundance of polar bears under climate change
These projections depend heavily on the emissions pathway the world follows. Under aggressive decarbonization scenarios, ice loss slows and some subpopulations in the high Arctic retain viable habitat through the century. Under high-emissions scenarios, summer sea ice effectively vanishes from most of the Arctic, and the bears that depend on it follow. The future of polar bears is not written. It is a policy choice disguised as a wildlife question.
Hunting and International Management
Polar bears are managed under an international treaty supported by all five nations where bears occur: Canada, Greenland (Denmark), Norway, Russia, and the United States. Consensus harvest principles are designed to allow sustainable hunting, primarily by Indigenous communities with deep cultural and nutritional ties to the species, while providing flexibility for each jurisdiction to tailor its approach. Canada, where roughly two-thirds of the world’s polar bears live, is the only country that still allows regulated sport hunting (in some territories, guided by Inuit outfitters). Russia banned all hunting in 1956 and has maintained the prohibition, though enforcement in remote areas is inconsistent. Norway prohibits hunting entirely in Svalbard.
The management question is not simply whether to hunt or not. For many subpopulations, the sustainable harvest level calculated a decade ago may no longer apply if the population has since declined due to ice loss. Updating quotas requires updated surveys, and as discussed above, many subpopulations go years or decades between assessments. The risk is that harvest quotas based on older, higher population estimates continue to be applied to populations that have quietly shrunk, adding hunting pressure on top of climate-driven stress.