It’s ok to have kids. Adopting kids is nice and that’s ok too.
Anybody who's having kids today sure better hope so.
Look into Tony Seba to see how fast the transition to RE is happening.
We could also geoengineering the climate if it become a real problem.
OK, so the meaning of our lives is to perpetuate the species. Not too bad; if it's good enough for (the other) animals, why not for us too?
Ya want anything beyond that, it would logically have to be to make mankind of the future a better species than right now. Which of course you do by making your kids better persons than you are. So then you're back to them again.
My cat drinks from the toilet.
We can open a bottle of Evian instead of drinking from the toilet. We can cook an Impossible Burger instead of stalking, hunting, and devouring a cardinal in the front yard. We can run a bath instead of licking ourselves. We can realize having kids is a terrible choice given what we know about the world and choose to not have them.
With the certainty of climate change, it feels like adoption is the only moral/ethical way to do this.