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Climate change is now the biggest concern in the Arctic and is causing unpredictable changes to the sea ice, making the life of polar bears (Ursus maritimus) more difficult. Although polar bears respond and adapt to all the changes in the environment actively and quickly, climate change still brings them some negative impacts. Historically, the earth has experienced many eras when the climate goes up and down. However, rising in temperature has been happening at a marked rate, 0.32°F per decade, while 2021 ranks as the sixth-warmest year. The consequences of global warming led to an earlier winter break-up and ice melting; those cause polar bears to lose their habitats and have less praying time. The populations of seals, which are their primary food resource, are also affected by the unusual climate. As a result, some of the polar bears are forced to turn their target from the ice into the shores and even human territories. The loss of ice also led to a further distance between pieces of ice, which forced polar bears to swim for a longer distance for migrating. Moreover, without enough energy being stored, pregnancy then becomes a hard task for female polar bears. Therefore, the size of litter has been declined while the health conditions of adult polar bears also went down. Although actions have been taken both nationally and internationally to prevent polar bears from going extinct and stop climate change, little achievement was made.
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