Reconstructing the climate changes of the past is extremely difficult, because systematic weather observations began only a few centuries ago, in Europe and North America.

重建过去的气候变化是极其困难的，因为在欧洲和北美，几个世纪前才开始系统的天气观测。

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Bond hypothesized that the alternating cycles might be evidence of changes in ocean-water circulation and therefore in Earth's climate.

邦德推测，这种交替循环可能是海-水间循环变化的证据，因此也会影响地球的气候。

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Information on temperature, rainfall, and other aspects of the climate that can be inferred from the systematic changes in properties is usually referred to as proxy data.

关于温度、降雨量和气候的其他方面的信息可以从性质的系统变化中推断出来，这些信息通常被称为代理数据。

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A Royal Society research team member, Jules Pretty, says the team took into account a number of changes that are expected in coming decades, such as climate change, massive rises in world population, and new consumption patterns.

VOA: standard.2009.10.21

Climate panic, after all, is fear of dramatic, life-altering climate changes, not about tenths of a degree.

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In just a few decades, humans have managed to cause the kind of atmospheric changes that it took geological climate cycles millions of years to accomplish.

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This is roughly equal to the timescale of climate changes predicted by computer models.

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