在两极冰层里,科学家取出圆柱形的冰芯,那里封着的气体,就是地球千万年来的气候日记。庆幸冰比水轻吧,否则从水底开始结冰,有没有我们人类出现还未必呢。2010年,靠近北极的格陵兰岛崩裂下一块巨大的冰川,面积260平方千米,那是多么辽阔而叉孤独的存在。在8亿年前,地球曾经数度被冻成一整个大冰球,地质史上称为“雪球地球”。 In the polar ice, scientists remove the cylindrical ice core, where the gas trapped is the climate diary of millions of years on Earth. Fortunately, ice lighter than water it, or from the bottom began to freeze, there is no human emergence of it yet. In 2010, Greenland, near the North Pole, cracked a giant glacier with an area of ​​260 square kilometers, which is vast and lonely. 800 million years ago, the Earth was once frozen into a whole large ice hockey ball, known as the “history of snowball Earth” in geological history.