Part One describes the Medieval WarmPeriod, roughly 900 to 1200.
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。
2
Global temperatures began to rise slowly after 1850, with the beginning of the Modern WarmPeriod.
1850年后，随着现代暖期的开始，全球气温开始缓慢上升。
3
Because the midpoint of the Medieval WarmPeriod was about 850, an extension of Bond's cycles would place the midpoint of the next warm interval in the twenty-fourth century.