I don't think we really had to have a study involving fitting Polar bears with cameras on their collars to predict that the dramatic decline in Arctic sea ice would create real problems for these animals (https://news.nationalgeographic.com/2018/02/polar-bears-starve-melting-sea-ice-global-warming-study-beaufort-sea-environment/). The loss of sea ice results in reduced a) locations where the bears can ambush seals coming up to breathe and b) areas where the bears can hunt free from interference by their own species (all bear species require very substantial home ranges).
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