So, these are new data Rob Berner and I -- from Yale -- put together, and what we try to do now is track the amount of carbon dioxide in the entire rock record -- and we can do this from a variety of means -- when these -- what I call greenhouse mass extinctions -- took place.
这些数据是来自耶鲁的Rob Berner和我一起得出的， 我们现在试着 追踪整个岩层的二氧化碳含量。 我们有很多种方法。 在我称之为“温室物种大灭绝”的情况发生时， 就会有这些红线了。