科学家通过各种手段研究气候变化 的迹象。最直接的气候纪录是气象部门 的数据。这种记录尽管精确,却不容易 得到,尤其是很早以前或者偏远地区的 数据。当然,科学家还使用其他的气候 纪录。例如,树木的年轮可以以年为单 位记录温度和降雨量。植物的花粉可以 记录温度与湿度。冰川侵蚀的地貌特征 也可以衡量过去年代的气候。钻取陆地 冰川的样本也能考察过去年代的气候状 况。冰核是很好的记录器,它能把过去 Scientists study the signs of climate change through various means. The most direct climate record is the meteorological department’s data. Although this type of record is accurate, it is not easy to obtain, especially data from very early or remote areas. Of course, scientists also use other climate records. For example, the annual rings of trees can record temperature and rainfall in years. Plant pollen can record temperature and humidity. The geomorphological features of glacial erosion can also measure the climate of the past. Drilling samples of land glaciers can also examine the climate of the past. Ice nucleus is a good recorder, it can put the past