The mass haul-out of walrus is a [ symptom of damage to a specific ocean ecosystem that depends on sea ice ]( http://www.theguardian.com/environment/2014/oct/03/walrus-alaska-beach-climate-change-arctic-ice ) . With more heating, eventually there won't be any sea ice.
Ссылка: https://stallman.org/archives/2014-jul-oct.html#03_October_2014_%28Mass_haul-out_of_walrus%29