Scientists have reviewed decades of satellite measurements to reveal how and why Antarctica's glaciers, ice shelves and sea ice are changing. Their report explains how ice shelf thinning and collapse have triggered an increase in the continent's contribution to sea level rise. “Although breakup of the ice shelves does not contribute directly to sea-level rise — since ice shelves, like sea ice, are already floating — we now know that these breakups have implications for the inland ice,” said Helen Fricker.I n the Amundsen Sea, for example, ice-shelf thinning of up to six metres per year has accelerated the advance of the Pine Island and Thwaites glaciers by as much as 1.5 km per year. These glaciers have the potential to raise sea levels by more than a metre which are unstable.