代理记录充分表明的是，气候在比几千年更长的时间跨度内发生了重大的自然变化。

What the proxy records make abundantly clear is that there have been significant natural changes in the climate over timescales longer than a few thousand years.

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但是，在基本相同的时间跨度内，由于温度过高，死亡率竟增加了5.74%。

But in similar periods of extremely hot weather, mortality rates increased 5.74 percent.

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在公元1400年到1900年的时间跨度内，有一种周期性的循环，即在一段动乱之后，接着会有一个相对平静的阶段见图fig。

In A.D. 1400-1900 tends to follow a cyclic pattern with a turbulent period followed by a relatively tranquil one Fig.

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