evidence: Study of Greenland ice core reveals new clues about historic climate changes A 140 meter ice core from Greenland’s west coast has shown ice caps sometimes grew during periods of warming over the past 2,000 years. [...] Over the past two millennia, ice caps along the frigid slopes of Greenland’s west coast sometimes expanded in response to a warming climate, according to a new study of ice cores published in Nature Geoscience.