Three gigantic icebergs broke off from the Ronne Ice Shelf in Antarctica early this month and are now adrift, say scientists at the U.S. National Ice Center. The icebergs have a combined surface area slightly smaller than the state of Connecticut. An unusually high number of icebergs have calved from Antarctica’s Ronne and Ross ice shelves in recent years, a trend some scientists say could be an early sign of global warming.