由于种种原因，在古新世-始新世极热时期地球大气中碳上升的量。
During the PETM, for reasons that are still unknown, the amount of carbon in Earth's atmosphere rose rapidly.
当海洋学家研究这些样本时，他们可以看到在古新世-始新世极热时期碳循环的改变。
When oceanographers study these samples, they can see changes in the carbon cycle during the PETM.
Dickens说，结论是：导致古新世-始新世极热时期气候变暖的主要原因不是二氧化碳，而是另有其物。
The conclusion, Dickens said, is that something other than carbon dioxide caused much of the heating during the PETM.
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