"We went to Antarctica to understand how changes to its vast ice sheet might affect the world. Flowing lines on these maps show how the ice is moving.
Ice sheets flow downhill, seemingly in slow motion. Mountains funnel the ice into glaciers. And ice flowing from the land into the sea can form a floating ice shelf.
Glaciers in certain areas have been undercut by warmer ocean waters, and the flow of ice is getting faster and faster.
The acceleration is making some scientists fear that Antarctica’s ice sheet may have entered the early stages of an unstoppable disintegration."