第一部分描述了大约在公元900年到公元1200年的中世纪温暖期。

Part One describes the Medieval Warm Period, roughly 900 to 1200.

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由于中世纪温暖期的中点约为850年，因此邦德循环的延长将使下一个温暖间隔的中点出现在二十四世纪。

Because the midpoint of the Medieval Warm Period was about 850, an extension of Bond's cycles would place the midpoint of the next warm interval in the twenty-fourth century.

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“现在对中世纪温暖期还不甚明了的是彼时美国西部地区的温暖程度，”史威特南说。

"What's not so well known about the Medieval warm Period is how warm it was in the western U.S.," Swetnam said.

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他说，在中世纪温暖期时代，大范围的火灾每隔3至10年就会席卷巨木林的部分区域。

During the Medieval Warm Period extensive fires burned through parts of the Giant Forest at intervals of about 3 to 10 years, he said.

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他说，在中世纪温暖期时代，大范围的火灾每隔3至10年就会席卷巨木林的部分区域。

During the Medieval Warm Period extensive fires burned through parts of the Giant Forest at intervals of about 3 to 10 years, he said.

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