地球的力量 第5集 稀有行星(22):比較大的挑戰(zhàn)

Earth has been blessed with just the right balance ofstability and the occasional catastrophe.

地球被賦予了適宜的穩(wěn)定 還有偶爾的災難

Too many catastrophes and life never gets a chanceto develop.

太多的災難，生命沒有機會產生

Too few, and life gets stuck in a rut.

太少的災難，生命被困在定例中

It's taken four and a half billion years to turn the Earth from a barren rock

花費了45億年，地球從荒蕪的巖石

into the world we see today.It's been a remarkable journey.

變成我們今天看到的世界 這是一個了不起的過程

But now the planet's facing perhaps its greatest challenge.

但是現(xiàn)在地球也許面臨著最大的挑戰(zhàn)

Humans.Just look at Earth from space.

現(xiàn)在有一股新的力量在威脅這個獨一無二的星球 人類本身

At night, our lights mark out our domination of the world.

晚上，我們的光顯示出我們統(tǒng)治著地球

By burning fossil fuels like coal and gas,

通過燃燒化石燃料比如煤和天然氣

we've changed the very composition of the atmosphere,and with it, the climate.

我們改變了大氣層的組成 結果提高了溫度