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In a cave in rural Wyoming, lies a time capsule from the ice age.
在懷俄明郊區的一個山洞里，有個從冰期留下的時間膠囊。
It contains the remains of not one, but two huge mammals.
里面有兩具巨型哺乳動物留下的遺骸。
Ferocious beasts who dwarf even the most powerful predators of today.
這些猛獸讓如今最厲害的掠食者都相形見拙。
New discoveries bring to life these true ice age monsters.
新的發現讓這些冰期怪獸重見天日。
They were the Earth's largest animals, the ultimate predators.
它們曾是地球上最大的動物，終極掠食者。
New technology and forensic evidence helps paleontologists bring to life some of their final moments.
新的科技和現場證據如今幫助古生物學家們重現了它們生命中的最后時刻。
Our planet is in the throws of dramatic global change.
我們的星球會正經歷著劇烈的全球變化。
Rising temperatures are triggering chain reactions throughout the world.
氣溫升高在全世界引發了連鎖反應。
But the earth seems to hold clues indicating this has happened before.
不過地球上有些線索說明這并非首次發生。
In the past, dramatic shifts have thrown off the balance of the natural order.
劇烈變化在過去就曾經打破過自然秩序的平衡。
10,000 years ago, at the close of the Pleistocene era, the earth was very different.
一萬年前，更新世末期，地球與現在大不相同。
Rising temperatures ended an ice age that saw great glaciers covering most of the northern hemisphere.
氣溫的升高終結了冰期，在冰期巨型冰川覆蓋了北半球大部分。
Cold-adapted creatures were driven into extinction, allowing new plants and animals to take their place.
適應寒冷氣候的生物因此滅絕，新的植物和動物替代了它們的位置。
Glaciers that once covered North America to depth of over two miles retreated under rising temperatures.
隨著氣溫的上升，曾經覆蓋北美洲深達兩英里的冰川開始消退。
These massive sheets of ice gouged deep scars in the landscape, leaving behind a legacy carved in stone.
這些巨大的冰層在陸地上鑿出深深的疤痕，巖石上的刻痕就是它們的遺跡。
In what became Wyoming, dramatic climate changes had a catastrophic impact on life.
在當時的懷俄明，劇烈的氣候變化給生命帶來了災難性的沖擊。
Giant beasts, like the wooly mammoth and giant sloth, died off to be replaced by better adapted creatures that migrated across land bridges from the north.
像長毛猛犸象和巨型樹懶這樣的巨大動物都滅絕了，取而代之的是適應力更好的生物，它們從北部通過陸橋遷徙而來。
But this migration had repercussions.
不過這種遷徙也有后果。
Massive mammals clashed for the first time.
巨型哺乳動物發生了第一次碰撞。
And some of these were predators.
它們中有一些是掠食者。
