This is the story of wildlife conservation in the age of mass extinction.
这是个关于在大规模的物种灭绝时代保护野生动物的故事。
Many scientists have therefore concluded that a sixth great mass extinction is currently in progress.
因此，许多科学家得出结论，第六次大规模物种灭绝正在发生。
Each mass extinction may have had a different cause.
每一次大灭绝可能都有不同的原因。
The mass extinction would have occurred very suddenly under this hypothesis.
在这种假设下，大灭绝的发生是非常突然的。
Various theories seek to explain this mass extinction.
对于这次大灭绝，有很多种解释。
But the Mesozoic, too, began with a mass extinction.
但中生代本身便是以一次大灭绝开始的。
Yet sheer Numbers do not totally explain the current mass extinction.
然而，当前物种的大规模灭绝不光是人口数目激增造成的。
Yet sheer Numbers do not totally explain the current mass extinction.
然而，当前物种的大规模灭绝不光是人口数目激增造成的。
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