I see that the Danish Prime Minister placed a call to President Trump shortly before he left for Europe, possibly in an effort to smooth over the kerfuffle she created by her rude response to the President’s off-handed comment about buying Greenland.My sister had a better idea: we trade the Danes Greenland for Puerto Rico. That way the Danes will have someplace warm to go in the winter when there’s only 6 hours of sunlight in Denmark and we’ll have someplace America’s Green New Deal crowd can go to observe the melting of glaciers. And they can stay there and...