In layer upon layer of chemically distinctive water are traces of past atmospheres and ecosystems, forest fires and earthquakes and solar variation.

通过研究冰层之间化学性质各异的冰水，研究者们可以追溯古代大气、生态系统、森林大火、地震和日照的变化情况。

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Despite this variation, the TSI has dipped to the same level during the three previous solar minima. Not so during this recent elongated minimum.

即使考虑了这一波动，TSI在前三次的太阳极小期中依然下降到相同的水平，然而在这次较长的极小期却不是这样子了。

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The variation at the lower solar elevation is caused by the cosine response of the instrument.

而太阳高度角较低时此值的变化，主要由仪器的余弦响应所引起。

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Dr White thinks there may be an unknown one that varies on roughly the same timescale as the more regular solar cycle, and thus tends to fall into step with it, amplifying the solar variation.

ECONOMIST: The earth��s climate

The research indicated that influences in solar changes and intermittent volcanic activity have accounted for at least 80% of observed climate variation over the past half century.

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In an interesting variation on this theme, last year construction giant KB Home struck a deal with a Chinese solar company, BYD, to build new, moderately-priced homes with solar panels already installed in Lancaster, California.

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