- The only way minerals there will be mined profitably is by someone strongarming and displacing any local population, disregarding all environmental protection rules and destroying large swathes of land

- They either mine the minerals responsibly or ask their king to take over the country so they can mine irresponsibly

- Bribery to vote for independence and subsequent joining with the US is the only legal way that Greenland will become part of the US. It would have to be accepted by the Kingdom of Denmark

- Depends on whether it is done legally or with force. If done with force NATO would go under pretty fast. If done with bribery NATO is probably done anyway just way further out.