Are you in a room with CFL or any sort of fluorescent lighting? Your MBP has a CFL backlight you know
Fluorescent lighting will cause the green tint, the iPhones lens or one of the elements tends to over exagerate it for some reason (if you look at the lens its already a green'ish tint). I noticed I have the same green tint at my office, outside no green tint. My house is mainly CFL, during the evening I can see a slight green tint against my wall, in the day with natural light no green tint on the same wall.
This is not an issue with the phone, its the type of lighting that you are in and its affect on the camera lens. I'm surprised a photographer hasn't already chimed in here on this considering how many of them are on this forum.