A new space-based study of Antarctica shows its ice sheet is shrinking. [...]
The new study, conducted by scientists at the University of Colorado at Boulder, uses a technique which has not been tried before: measuring gravity over Antarctica.
Data comes from a pair of satellites together known as Grace which orbit the Earth in tandem, measuring changes in its gravitational field.
When they fly over regions where there is lots of material below, such as mountain ranges, or where crustal rocks are more dense, they will register an increase in the Earth's gravity - tiny, but measurable.