01 December 2017
Vol 358, Issue 6367

About The Cover

Cover image expansion

COVER Wahlenbergbreen glacier in Svalbard, Norway, is seen in September 2013, as its flow began speeding up. At the peak of the surge, beginning in 2015, the ice advanced at 9 meters per day, bulldozing everything in its path. A glacier’s shape, the nature of its bed, and climate change can interact to trigger normally quiescent glaciers to surge. See page 1120.
Photo: Heïdi Sevestre