Trump was pretty clear in his last term that the earth heating up would be an economic boon. The North West passage is one of the Holy Grails they are looking foe
So that's why he 'wants' Greenland. It's a new Cold War against China, and Russia in the Arctic. Sadly, that means climate change is a forgone conclusion after this Cold War, we won't have much of a planet to live on for most of Earth. A sad statement of fact that China, Russia, and the US are picking their nations over fighting climate change, but that's realist geopolitics for you..
When people like this say the green technology is economically unviable, they do not mean that green technology costs too much. They mean they can't find another route to ship goods