One does not need carbon on the moon to make the moon profitable. 1) No guarantee people would be required on site. 2) If people are required on site you tight

One does not need carbon on the moon to make the moon profitable. 1) No guarantee people would be required on site. 2) If people are required on site you tightly control the carbon cycle, this is the same thing that occurs on earth, just that the earth is doing this on a scale many orders of magnitude larger.