To get to Greenland though he's mostly got to go through Canada's territorial waters first, or else take a very long way around in the Alantic Ocean (giving more time for everyone to prepare a response).
So, he'd be willing to take on both Canada and Denmark (who'd likely be backed up by other members of the EU) ?
More hot air.
Let's not forget the sacrifices made to avoid splitting the vote, such as https://www.cbc.ca/news/politics/green-party-list-of-candidates-debates-1.7510915