Antarctica has long been considered a last redoubt of cold in a warming globe. But new science suggests that a key part is warming up fast. Sam Eaton reports the finding could cause scientists to rethink their sea level projections for later this century.
The World’s Daniel Grossman reports from Greenland on disturbing changes. A new report says ice in Greenland and other northern regions is melting far faster than predicted just a few years ago, with possibly serious consequences for global sea levels.