> Not having a child is the single greatest thing an individual can do to reduce their carbon footprint.

So what?

I say that in all sincerity. You have internalized your worldview to the point that it's a religion you don't realize you believe.

Why is reducing my carbon footprint a fundamental good? Ultimately, any explanation will come down to the meaning of life, and it is very likely that you and I might understand our purposes here differently.