Cost estimates vary, even as Denmark says Greenland is not for sale

President Donald Trump's plans to acquire Greenland could cost U.S. taxpayers up front and over the long term. Denmark's leaders have said the semi-autonomous Danish territory isn't for sale. So have Greenland's leaders, who depend on fishing and subsidies from Copenhagen. Denmark's central bank noted in a recent report that Greenland's "economy is slowing down, with modest growth and serious challenges for public finances." Trump said U.S. ownership of Greenland is vital to national security, citing concerns that the island could otherwise be controlled by China or Russia. He has said his preference is to buy Greenland. "I would like...