Right before the extinction events, the first proto-amphibians made it onto shore.
正是在此次灭绝之前，原始两栖动物第一次爬上了陆地。
There have been five planetary extinction events in the last half-billion years. The sixth is happening now.
在过去几千万年漫长岁月中，曾经有五个行星消失，现在第六个行星的消失正在发生。
Otherwise, "one neat thing about mass extinction events is that they're often reset buttons, where you change what dominates the globe, " Conrad said.
从另一个角度看，“巧妙之处在于，大灭绝事件就像重启按钮，通过它可以改变主宰地球的物种，”Conrad 说。
Scientists warn that without an agreement to reduce so-called green house gas emissions, global temperatures will continue to rise, with the catastrophic consequences of extreme weather events, the spread of drought and disease, and the extinction of plant and animal species.
VOA: standard.2009.12.09
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