Polar bears are one of the symbols of the fight for survival. Summers are lengthening, planet temperatures are increasing and there is less and less ice.

When the frozen blocks of the Arctic disappear, bears spend more time on land, where it is difficult to find food. A study published today in Nature Communications presents a portrait of the challenges that the 25,000 polar bears left on the planet face in order not to die of starvation. The study's findings have important implications for the conservation of polar bears.