在选择确定过去存在的气候条件的方法时，古气候学家援引了四个主要标准。
In choosing a method for determining climatic conditions that existed in the past, paleoclimatologists invoke four principal criteria.
气候学家是时候转守为攻了。
It is time the climate scientists stopped just playing defense.
当今的气候学家还有很多要向他们学习。
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