Not everyone has opted to make this transition. Even now, there are segments of society which are adamant in maintaining a natural, minimally upgraded human body. -Religion? Many of the early settlers on Mars actually wished for it to remain in its raw, primeval state. Some of them had an almost spiritual connection to the planet. Like certain environments on Earth, they believed it held an intrinsic worth and unique value that should never be replaced. To better it with manmade artificial processes would somehow make it less natural, less real. -Religion?