[00:01:19]As the weather warms,

随着天气变暖

[00:02:50]the ice beneath the bears' feet starts to break up and then melt.

北极熊脚下的冰层开始分裂融化

[00:07:39]And as the ice dwindles,

冰层消逝

[00:09:20]so do the bears' chances of a successful hunt.

北极熊狩猎的成功率也随之骤降

[00:16:18]Most of the ice is lost over these shallow coastal waters,

近海浅水表面的大部分冰层都已融化

[00:20:09]where most of the seals live.

大多数海豹生活在这里

[00:21:45]It's now summer and these bears have a choice-

现在处于夏季 北极熊们有两种选择

[00:31:01]take their chances on the shrinking ice floes,

前往正在消融的浮冰上冒险觅食

[00:32:59]or make for the safety of the land.

或留在陆地上确保安全

[00:41:21]It's a case of sink or swim.

不想被淹没 就得游走

[00:43:36]Bears have always gone hungry in the summer,

在夏季 北极熊容易饥饿

[00:53:51]but the length of time when there's enough ice

但北极大部分地区的冰层

[00:55:41]for them to go hunting

正在迅速消融

[00:57:03]is getting shorter and shorter, across much of the Arctic.

所以它们的狩猎时间也越来越短

[01:04:04]This is hitting cubs particularly hard,

这对熊宝宝的打击尤其大

[01:07:18]because they can't survive for as long

因为如果像母亲那样长时间不进食

[01:09:24]without feeding as their mother.

它们就无法生存

[01:11:48]Cubs that were born underweight are at the greatest risk.

出生时体重过轻的熊宝宝 危险最大