另一个重要的推动因素是小冰期的开始，这一气候现象导致北半球气温下降。
Another important push was the onset of the Little Ice Age, a climatic phenomenon that led to cooler temperatures in the Northern Hemisphere.
并非如此：历史纪录表明，疟疾此前已经在温带地区广泛分布——最北到了斯堪的纳维亚地区——并且甚至在小冰期的最冷的年份存活了下来。
Not so: historical records show that malaria has previously been widespread in temperate regions - as far north as Scandinavia - and survived even during the coldest years of the Little Ice Age.
小冰期是距今最近，特征最明显的寒冷气候事件，对于研究世纪尺度气候变化具有重要意义。
The Little Ice Age is the latest and the most typical case of cold climate event, which is significant for the research of centennial climate change.
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