Thanks to shrinking sea ice, National Geographic puts global warming on the map A smaller Arctic ice shelf is the biggest change National Geographic cartographers have made since they had to divvy up the U.S.S.R. By Samantha Larsonhttp://grist.org/news/thanks-to-shrinking-sea-ice-national-geographic-puts-global-warming-on-the-map/?utm_source=newsletter&utm_medium=email&utm_term=Daily%2520June%252024&utm_campaign=daily