The ice sheet that covers the northernmost reaches of our planet has expanded and shrunk over the past 2 million years -- but it was thought that Greenland's bitter cold and miles-deep ice had been a more or less constant feature.
원문출처 : https://www.cnn.com/2021/03/17/world/ice-arctic-plants-fossils-greening-climate-scn/index.html
원문출처 : https://www.cnn.com/2021/03/17/world/ice-arctic-plants-fossils-greening-climate-scn/index.html