Polar Bears and Climate Change: Starvation, Stress, and a Narrowing Future

Polar bears depend entirely on sea ice for hunting. As Arctic ice shrinks, individual bears face prolonged starvation, physiological stress, and increasing human conflict.

Key Facts

Polar bears (Ursus maritimus) hunt primarily on sea ice, relying on ringed and bearded seals for the fat-rich diet needed to survive Arctic winters.
Arctic sea ice has declined by approximately 40% in summer extent since satellite records began in 1979; the trend is accelerating.
Bears are spending longer periods on shore without food as ice-free seasons lengthen — summer fasting periods have extended by 3–4 weeks in some populations since the 1980s.
Body condition scores in Hudson Bay polar bear populations have declined significantly, with bears now thinner at denning time than historical records show.
Bear-human conflict is increasing as food-stressed bears enter communities searching for food; more bears are being killed in defence of life and property.
Polar bear cub survival rates are falling in some populations as thinner mothers produce less milk and cubs are weaned at lower weights.

Welfare Considerations

Individual polar bears experiencing the effects of sea ice loss suffer in concrete, measurable ways. Extended fasting causes muscle and fat catabolism, immune suppression, and ultimately organ failure in animals that cannot find food. Cubs born to food-stressed mothers are underweight, less immune-competent, and more vulnerable to harsh conditions. Bears entering human communities face disorientation, translocation stress, and often lethal conflict. The welfare impacts of climate change on polar bears are not future projections but present realities in Hudson Bay, the Beaufort Sea, and other regions where sea ice loss is already severe. Climate mitigation is polar bear welfare intervention — the most direct action available to prevent ongoing individual suffering.

What You Can Do

Support Polar Bears International, which funds polar bear research and climate advocacy.
Reduce your carbon footprint — transport, diet, and energy use choices contribute to the emissions driving Arctic warming.
Advocate for ambitious national and international climate commitments, specifically referencing Arctic ecosystem and wildlife welfare.
Support community-based polar bear alert programmes in Churchill, Manitoba and other Arctic communities that reduce conflict killing.
Donate to WWF Arctic conservation programmes that address both climate advocacy and on-the-ground bear protection.