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It seemed as though Courtillot must have found the cause of the extinction.
由此看來(lái)，Courtillot已找到了引起大滅絕的原因。
Here was a truly massive destructive event that had happened at exactly the right time.
這里的確發(fā)生過(guò)毀滅性的事件，而且?guī)缀蹙驮诋?dāng)時(shí)。
Yet the evidence was not as straight forward as it appeared.
然而這些證據(jù)看來(lái)并不直接。
In America, geologist Peter Ward was alos looking at the evidence.
在美國(guó)，地質(zhì)學(xué)家Peter Ward也在研究這些證據(jù)。
He knew that to do so much damage the change in world temperatures would have had to have been rapid and dramatic.
他認(rèn)為要造成如此大的災(zāi)難氣溫就必須急劇上升，
You have to have a very sudden, but very large increase in temperature
必須是非常突然和非常劇烈的升溫現(xiàn)象，
to have done the mayhem and the destruction that is this mass extinction.
才能造成生物大滅絕這樣的災(zāi)難和破壞。
Ward looked more closely at the data from the Siberian Traps.
Ward更加仔細(xì)地研究了西伯利亞地盾的數(shù)據(jù)。
He estimated the amount of lava they'd produced
他估算了火山爆發(fā)產(chǎn)生的熔巖量，
and used this to calculate how much carbon dioxide they would have emitted.
并依此算出這些熔巖所能釋放出的二氧化碳總量。
He then calculated what this would have done to world temperatures.
接著他又算出它們將對(duì)全球溫度造成多大影響。
We've looked at the Traps, the Siberian Traps,
我們研究了西伯利亞地盾，我
we've tried to estimate how much gas would have come out of them and how much warming would that have done
們推算熔巖會(huì)產(chǎn)生多少氣體以及它們會(huì)使地球氣溫升高多少度，
and it turns out that in the worst case scenario, and of course for the world it was a worst case,
結(jié)果，在假想的最差情況下，當(dāng)然，這也是對(duì)地球來(lái)說(shuō)已經(jīng)是最差的情況了，
they may have raised the temperature of the earth about 5 ℃.
它們能使地球溫度升高5℃。
