We’re not resticted to a small island, or even this planet.
The Earth is an island, and yes, we are restricted to it. The human race moving to another planet after we have destroyed this one is science fiction. Not going to happen.
Some feel the globe is a fragile accident of... what? fate? chance?
Some believe God made the globe and was no dummy, that He made it capable of standing up to whatever would be thrown at it, because there’s a story with an end He has already written.
In fact, there are commercial ventures already invested in the millions of dollars to do just that.
/johnny
Even as we speak Captain Sir Elton John and an intrepid rear admiral are planning a trip to Uranus hoping to root out mineral rich assterrhoids which would ... this isn’t going anywhere.
Never mind.