BOLDUAN: President Trump confirms for the first time that he has been considering trying to purchase Greenland. Listen to this.</s>TRUMP: The concept came up and I said, certainly, I would be - strategically, it's interesting and we'll be interested. But we'll talk to them a little bit. It's not number-one on the burner. I can tell you that.</s>BOLDUAN: It's somewhere on the burner apparently. This, as the Danish prime minister called the idea, quote, unquote, "absurd," also saying Greenland is not for sale. Greenland is not Danish. Greenland belongs to Greenland. That's the prime minister. And the former U.S. ambassador to Denmark added this to CNN.</s>RUFUS GIFFORD, FORMER U.S. AMBASSADOR TO DENMARK: I can tell you, if anybody in the Obama administration had brought up purchasing Greenland, we would have been laughed out of the room.</s>BOLDUAN: But it's not just that Greenland is now at the center of this international kind of real estate controversy. Greenland is also at the center of the climate crisis. CNN's Frederik Pleitgen traveled there with NASA climate scientists to learn more.</s>FREDERIK PLEITGEN, CNN SENIOR INTERNATIONAL CORRESPONDENT (voice- over): Take off from a tiny airfield in south Greenland. NASA embarking on its mission to map how warmer ocean water is melting Arctic ice. Chief scientist, Josh Willis, shows me the probes they're launching all around Greenland. It's like dropping thermometers into the sea. (on camera): They go out of the plane, right down this tube right here, and fall down into the ocean, and then they separate into two parts, all the way down to the sea floor. So it gives us a profile from the surface to the bottom on the shelf. (voice-over): We've reached today's drop zone, the massive Helheim Glacier.
Trump Confirms He's Looked into Buying Greenland as NASA Warns of Its "Supercharged" Ice Melt.