Respectfully, and this is a very personal decision, I see it the opposite way that you do.
Our ability to counteract, or reverse, climate change will be directly related to the vitality and economic power of future civilization. So if you have lots of children, in a thriving society, then humanity will be more able to reverse climate change than it is today.
As data, consider that US emissions have already peaked. And "The proposed wind, solar and battery projects seeking interconnection to U.S. transmission grids today are enough to bring the country to 80 percent carbon-free electricity by 2030."[1]
Certainly we are a long, long way from making total global emissions negative. But we can give our children the tools they need to completely reverse climate change. And if there're in a healthy and thriving society they're likely to solve the problem that we have caused.
The slope of US emissions is already in the right direction - I can't wait for the total amount to go negative!
https://www.canarymedia.com/articles/transmission/the-us-has...