Its all about tracking and controlling the human herd.
While it can certainly improve urban efficiency, someday people might be restricted in their freedom to travel, because they have exceeded their carbon quota for the month.
https://www.rmit.edu.au/news/factlab-meta/-nothing-smart-about-smart-cities-falsehoods
Some day, a monthly and even a weekly personal carbon quota could be used to control people, but no one is supposed to think about such a time or possibility.
https://therabbitportal.blogspot.com/search?q=The+15+Minute+City