All these answers are so killjoy and boring.

Yes, fantasizing about billionaires fixing everything by making good on their bullshit marketing pitches is very exciting to credulous people.

Building habitats on other worlds doesn't prevent us from caring for this one.

If you believe that there's some magic means to have zero emissions launches into space that are in any way self-sustained without further launches to keep throwing resources after spent resources from an increasingly polluted, depleted, and warming Earth, sure, you can huff that hopium deep and hard and ignore the worsening material reality all around you.

Plus maybe trying to make a liveable environment in space can give us new insights in preserving the one at home.

You've bought deeply into billionaire bullshit and their bogus promises, especially as privatized space travel in the west becomes increasingly vanity tourism and marketing stunts. The accomplishments that such companies' underpaid and overworked workers achieve are not for the common good, nor can they be because they are publicly subsidized private companies seeking to maximize profits and expand their own venture capital appeal, and nothing more.