On Earth, among the surest indications of sunspot cycles are believed to be the rate that trees grow, as seen in the rings visible in the cross sections of their trunks.

在地球上，人们认为，表明太阳黑子周期最可靠的迹象之一是树木的生长速度，就像树干横截面上可见的年轮一样。

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History shows that big sunspot cycles' ramp up 'faster than small ones, "he says."

“历史表明，大的太阳黑子周期'跳跃'快于小的，”他说。

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So when solar scientists said last week that sunspot cycles might be going into hibernation, the impact on our planet's climate became a hot topic.

所以当太阳研究科学家上周宣布太阳黑子周期可能进入冬眠期时，对于地球气候所受影响的话题便成为了热点。

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It follows instead the pattern of natural causes, such as sunspot cycles, and ocean temperature cycles.

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Yet there is a curious historical correlation between sunspot cycles and global temperatures.

ECONOMIST: The sun has gone quiet