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The arctic is warming, and these cold-loving animals are facing a precarious future.
北極正在暖化，而這些喜愛寒冷的動物正在面對岌岌可危的未來。
For millennia, the arctic ocean has frozen over in the winter,
數(shù)千年來，北冰洋會在冬天全面凍結(jié)，
and then gradually melted throughout the spring and summer.
然后在整個春夏逐漸融化。
But in the last 40 years, the extent of the summer sea ice has declined by 50%.
但在過去40年來，夏季的海冰減少了50%。
Some predict that it will be ice free as early as 2035.
有些人預(yù)測最快2035年就會完全沒有冰了。
This profound change is already having an impact on the arctic ocean's highly specialised wildlife.
這個影響深遠(yuǎn)的轉(zhuǎn)變，已對北冰洋的高度獨(dú)特野生動物群造成沖擊。
With less summer sea ice from which to hunt seals, some polar bears are now travelling up to 400 miles.
隨著夏季海冰的減少，某些北極熊會跋涉長達(dá)四百英里去獵捕海豹。
Swimming continuously for up to ten days in search of land.
連續(xù)游泳長達(dá)10天以尋找陸地。
Wrangel island, off arctic Russia, the only land for almost 100 miles.
弗蘭格爾島，北極俄羅斯的外島，將近方圓一百英里內(nèi)的唯一陸地。
Each summer, more and more polar bears come ashore here.
每年夏天，越來越多北極熊來到這里。
This newly arrived mother needs to find food for her family.
這位初來乍到的母親需要為全家人尋找食物。
But knows not to approach other adult bears.
但它知道別接近其他成年熊。
A full-grown male can kill and eat a cub, and will do so if other food is in short supply.
一只成年公熊能夠殺死并吃掉一只幼熊，假如其他食物短缺，它便會出此下策。
There are over 1,000 bears on this one island. It's the greatest concentration of polar bears on the planet.
島上有超過一千只熊。這里是地球上北極熊密集度最高的地方。
