DNA of trees, plants and insects including butterflies and spiders from beneath the southern Greenland glacier was estimated to date to 450,000 to 900,000 years ago, the remnants of a boreal forest that existed before the Earth cooled.

• 格陵兰南部冰河下找到的树木、植物及蝴蝶、蜘蛛等昆虫的DNA，年代推估在45万到90万年前，是地球进入冰河期前一片北方森林的遗迹。