A massive iceberg, twice the size of London, is heading towards South Georgia, threatening penguin and seal populations.

The world's largest iceberg -- a behemoth more than twice the size of London -- is drifting toward a remote island where scientists say it could run aground and threaten penguins and seals.

The world's largest iceberg -- a behemoth more than twice the size of London -- is drifting towards a remote island where ...