OP I completely feel you. I've been thinking a lot about this lately (every day) and as much as I adore my young teen, I feel incredibly worried about their future and guilty about bringing them into this.
Catastrophic climate change is a given now within a few decades, people won't stop their meat and dairy, mcdonald's and gas guzzlers and people are increasingly selfish and out for themselves imo. I hold out no hope for the current government or any meaningful systematic change to halt the decline.
I had them fairly young and in a whirlwind and probably didn't consider this seriously enough.
I've been thinking lately and were I in a position now to think about having children or not, I wouldn't do it. My child has debilitating long covid as well and faces repeated reinfection (because others are selfish) and therefore a difficult time even trying to have a 'normal' life and there's no help out there. Everyone acts like its over- its not. And more pandemics are coming due to animal agriculture, factory farming, antibiotic resistance etc. People have their heads in the sand (trying to cope, I know, but still).
Honestly, i think you're just being a realist and a really kind person. I think a lot of people have children for themselves, or because that's what they think they should do or aim for in life, but you're questioning this and thinking outside of that.
There's also the worry and responsibility placed on you if you do decide to have them- that existential stress weighs extremely heavy, take it from me.
I'd perhaps consider fostering or adoption if you want kids in your life, they are already here and you can make their lives better.
This is incredibly hard stuff to think about so be gentle with yourself 🌸