Therefore, the black carbon concentration in ice core samples can provide valuable information concerning the biomass burning and anthropogenic activity.

雪冰中碳黑记录的研究可以追溯历史时期生物量燃烧的信息， 以及为人类活动污染物的排放研究提供线索。

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For example, scientists can tell by the way ice crystallizes what the weather and temperature was like thousands of years ago in ice core samples from polar regions.

FORBES: New Study Shows Independent Evidence Of Global Warming

DDT, in ice-core samples taken on Svalbard.

ECONOMIST: Arctic pollution