By by Roberta Harrington in Los Angeles Undersea anchors of ice that help prevent Antarctica’s land ice from slipping into the ocean are shrinking at more than twice the rate compared with 50 years ago, research shows. Experts from the University of Edinburgh reveal that over a third of these frozen anchors, known as pinning points, have diminished since the early 2000s. The decline in pinning points, responsible for securing the floating ice sheets that support Antarctica’s land ice, could expedite the continent’s contribution to rising sea levels, caution scientists. This discovery stems fro…