“It would be nice to travel if you knew where you were going and where you would live at the end or do we ever know, do we ever live where we live, we're always in other places, lost, like sheep.”
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Writing a novel is not merely going on a shopping expedition across the border to an unreal land: it is hours and years spent in the factories, the streets, the cathedrals of the imagination.
Travel is the frivolous part of serious lives, and the serious part of frivolous ones.
If interstellar travel is as time- or energy- demanding as the above figures indicate, it is far from obvious what the motive for colonization might be.
Dealing with global warming doesn't mean we have all got to suddenly stop breathing. Dealing with global warming means that we have to stop waste, and if you travel for no reason whatsoever, that is a waste.