The rates of extinction happening today are as great as the rates during these mass extinctions.

现今物种灭绝发生的速度和这些大规模灭绝的速度一样快。

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Cases in which many species become extinct within a geologically short interval of time are called mass extinctions.

许多物种在地质上很短的时间间隔内灭绝的情况称为大灭绝。

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The Permian event has attracted much less attention than other mass extinctions because mostly unfamiliar species perished at that time.

二叠纪大灭绝事件比其他大灭绝事件受到的关注要少得多，因为那时灭绝的大多是我们不熟悉的物种。

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Over the past half billion years, there have been at least twenty mass extinctions.

NEWYORKER: The Sixth Extinction?

Mass extinctions, says Anthony Barnosky, are geological events in which at least 75% of animal species were wiped out.

BBC: Leaving our mark: What will be left of our cities?

The book explains how Earth will change for every degree rise in temperature - from droughts to mass extinctions.

BBC: Climate book is judges' hot pick