Yes, certainly overpopulation is another root cause. I do think that if everyone lived simply, overpopulation wouldn't be as much of an issue. But since we have to expend huge amount of resources per each human being, rising population numbers definitely comes into play.
Project Drawdown puts education of females near the top of the list as a high impact measure in terms of curbing carbon emissions.
https://www.drawdown.org/solutions/health-and-education
https://www.resilience.org/stories/2...echnologies-2/