Some of us are a lot more concerned about economic and opportunity inequality among people who have already been born then about problems created by climate change for those who can afford to create the next generation.
For many of these folks whose debt is keeping them from starting families, they have accumulated medical debt from having to accept higher deductibles on health insurance plans that they can afford to buy, educational debt to earn an over-priced degree at a university that still supports way too many do-nothing administrators, and huge mortgages from being forced to purchase overpriced homes near where they work thanks to the snob-zoning which has been passed in many of these same real-estate markets by the folks who already own homes and have started families, which they often turn around and try to justify in the name of "protecting the environment."