Would they always need earth to be habitable?
Because if they somehow managed to terraform and colonise another planet like mars, wouldnt they just make earth so uninhabitable that the rest of us would be forced to go where they are? (Prolly as slaves)
We’re already their slaves. And terraforming takes a colossal amount of energy and a ton of time. Despite all the problems we keep creating for our selves, the Earth is too perfect and “easy” to ditch in favor of a non earthlike colony that requires terraforming, IMHO
The human race is not capable of terraforming another planet, we can’t even fix the climate of our very nearly perfect planet.