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This vast forest circling the globe contains a third of all the trees on Earth
這片環繞著地球的廣大森林容納了地球上1/3的樹木
and produces so much oxygen it changes the composition of the atmosphere.
產生了大量氧氣，從而改變了大氣成分
As we travel south so the sun's influence grows stronger
隨著我們向南行進，太陽的影響力逐漸增強
and at 50 degrees of latitude a radical transformation begins.
北緯50°的地方是一場重大變革的起點
Summers here are long enough for broadleaf trees to replace conifers.
由于有足夠長的夏季，闊葉林得以取代針葉林
Broadleaves are much easier to eat and digest
闊葉樹的樹葉更容易食用和消化
so now animals can collect their share of the energy that has come from the sun.
因此動物們也能獲得太陽饋贈給它們的那部分能量
It's summer and these forests are bustling with life.
現在是夏天，森林中一片生機勃勃的景象
But the good times will not last.
可是好景不長
Broad leaves must be shed in winter for their damage by frost.
由于嚴寒的原因，闊葉樹得在冬天落葉
As they disappear, so the land becomes barren with little for animals to eat.
樹葉消失之后，大地一片荒涼，動物們的食物日益稀少
The inhabitants must migrate, hibernate, or face months of near starvation.
居民們只得遷往他處，或者冬眠，或者忍受幾個月的饑荒
