If I didn't want kids because of climate change, which is not a factor at all, I would call that an external factor, not internal. I would also call that a demo

If I didn't want kids because of climate change, which is not a factor at all, I would call that an external factor, not internal. I would also call that a demotivator rather than a motivator. Instead, what I'm talking about it that I have no baseline intrinsic motivation to have kids. I don't wake up thinking "I need to find a partner to have kids". Having kids isn't a thought that comes to my mind ever. Without this baseline internal motivation, what possible external, familial or societal, changes could occur to motivate me to have children? I can't think of any.