So far, only a handful of cores have been drilled that go back to the last ice age and none of them provide enough information to prove how the Amazon rainforest reacts to climate change.

• 参考译文)迄今为止，只钻探出来少量上次冰川期的核心物质，这些物质无法提供足够的信息证明亚马逊雨林如何对气候变化作出反应。