(Photo Credit: and then)
A chunk of Antarctic ice nine times the size of Manhattan has suddenly collapsed, putting an even larger glacial area at risk.
Satellite images show the runaway disintegration of a 220-square-mile chunk in western Antarctica.
British scientist David Vaughan says it's the result of global warming.
On the subject of global climate change, McCain acknowledged his position on the subject might be at odds with some in the audience.
"Suppose I'm wrong and climate change (is) not taking place," McCain said. "All we've done and given our kids is a greener world."