Polar bears are iconic symbols of climate change impact, with sea ice loss causing nutritional stress, increased human contact, and emerging welfare problems that will intensify with continued warming.
Polar bear welfare is being eroded by climate change in ways that are measurable at the individual level. Bears returning to land after sea ice retreats show lower body condition, particularly females that must sustain pregnancies and nurse cubs through the ice-free season on stored fat. Prolonged fasting causes physiological stress and reduces immune function. Female bears in poor condition produce fewer cubs or fail to raise those they produce. Cubs that are undersized at emergence from dens face higher mortality. Increased proximity to human settlements puts bears at risk of lethal removal in conflict situations. These are individual welfare harms occurring across thousands of animals whose futures depend on greenhouse gas emission trajectories.