**Organ transplants and Cannibalism**

Humans are resources, they have:

 - Body parts that can be transplanted into healthy people
 - Bones that can be used as material for art and other practical purposes
 - Meat that can be cooked and eaten
 - Hair that can be woven into clothes, fabric, and wigs
 - A hefty water content
 - Skin for leather

Once organs are harvested, the remaining biomass can be pumped dry of water, solid mass like bones then taken out, skin removed, and the rest used as fertiliser. Anything not used there and then can be stored for future use.

There's also a multitude of other things to be done:

 - Medical and scientific research
 - Medical and scientific education
 - Power generation ( plasma incineration )
 - Livestock feed