system
Given the following post, respond as if you're commenting on Reddit:
human
[Portal] Where does GLaDOS get the raw materials?

We see that those objects which are disposed of are incinerated, including used or malfunctioning turrets.  Yet there are entire factory lines making new turrets.  I understand that GLaDOS could rearrange most of the rooms from existing parts of the building that remained undamaged, but there doesn't seem to be any sort of recycling chamber.


I thought that perhaps the incinerated objects are used again for scraps after being incinerated, but the fire and heat would do intense damage, especially as we see that turrets are flammable when lasers hit them.  In addition, it seems like the cubes and turrets and any other waste products all go to the same place.  Unless they're all made out of a single compound, I don't see how it could be reused.
gpt
As a turret is melted down the metals it contains can be recovered easily.

The organic materials (mostly plastics from PCBs) are incinerated, but those can be farmed renewably:  There is a surface-level algae farm that pumps carbon dioxide from the incinerator exhaust for extra-speedy growth, the algae is then turned into oil and natural gas through a process called Thermal Depolymerization.  That oil can be used for making plastics, the gas is used in the incinerators (and in fuel cells for electricity) and the cycle begins again.