This gives a good impression how much that reduces the footprint compared to the commonly blamed activities: https://www.theguardian.com/environment/2017/jul/1

This gives a good impression how much that reduces the footprint compared to the commonly blamed activities: https://www.theguardian.com/environment/2017/jul/12/want-to-fight-climate-change-have-fewer-children https://www.theguardian.com/environment/2017/jul/12/want-to-...