It is nonsense. Canada isn’t going to cut energy exports arbitrarily. For that sector, modelling suggests that Americans would pay about $1.03 (!) for every $1 of tariff on electricity, and $0.98-0.99 on oil and gas.
Interestingly, if you have money (and there is the mantra that money makes money) buying a house and citizenship of Greenland right now might be quite profitable. Buying a stack of land could be very rewarding. Ah, how I dream.
Sort of gives the lie to the notion that a different arrangement is needed. Pituffik (used to be Thule) is in the NW, the US shuttered the southern ones because they were no longer seen as useful. The central ones were closed when NORAD moved from the DEW line further north. Pituffik is not actually part of that newer NWS line, but it completes the arc.
You can’t really buy land in Greenland, other than the small parcels on which houses are built and similar ones that are created around that purpose. Virtually the entire island is now held in common by the Greenland Inuit. Leases are possible, but it is not a straightforward process. Trump’s desire to ‘buy Greenland’ runs right into the ara of the Greenlanders centuries’ long effort to get out from under European colonialism. It isn’t Denmark’s to sell.
To be honest, I am not sure any of these threats and news about them belong in this thread. The American circus cannot be said to be an American circus when the debate is over annexing foreign lands. This is global now really.