The world's largest iceberg, A23a, is on a crash course towards South Georgia, threatening millions of penguins and seals.

A23a, a massive iceberg nearly the size of Rhode Island, towering at 40 meters, is on a collision course with South Georgia.

The world's biggest iceberg -- more than twice the size of London -- could drift towards a remote island where a scientist warns it risks disrupting feeding for baby penguins and seals. Meijers said this scenario could seriously impede seals and penguins trying to feed and raise their young on the island.