Kids can be raised in any economy

If you mean raising them just by doing the bar minimum, that's possible in any economy.

But the bar minimum here is just staying alive.

To raise kids who gonna grow up healthy, with good mental health and quality education, that takes money and good economy.

Raising holistically good kids are expensive

Point 2: Future is so uncertain - again, when do people say 'in these times of certainty, the future is clear'. No, the world is always uncertain. That's the beauty of it - endless possibilities

Climate change is irreversible and its effects are getting worser each year.

Sure, a few centuries before and nowadays are similar in that the future has always been uncertain.

However, climate change was at probably 0% back then. Now? Well...

Overpopulation - worst argument ever. We are in a crisis of declining birth rates, we NEED more kids!

Population in modern economy is a ponzi/mlm scheme. The longer we wait to bring down the population, the worse the effects gonna be when the population is brought down by the nature itself.