Graphic shows Chasm-1 has calved a huge iceberg the size of Greater London. Credit: British Antarctic Survey A huge iceberg nearly the size of Greater London has broken off the Antarctic ice shelf near a research station, the second such split in two years, researchers announced Monday. The British Antarctic Survey (BAS) said the formation of the new iceberg—in a natural process called "calving"—was not due to climate change, which is accelerating the loss of sea ice in the Arctic and parts of Antarctica. The iceberg, measuring 1,550 square kilometers (598 square miles), detached from the 150-meter-thick Brunt Ice...