Sorry I didn’t see your comment earlier. For some reason I didn’t get pinged on a few comments and need to play catch up. I was not able to find any additional information on the manufacturing process of polycarbonate sheeting in my research. It is a chemical process and certainly not completely free of negative side effects, but I made a determination that the positive attributes that it offered regarding allowing in light and reduced energy consumption in my house made it a better option than a product such as drywall which also has an extensive fabrication process. Additionally I purchased a scrap piece that was to be used as waste from another project and was already locally available. Decisions like this are why I call my house “green friendly” and not “green”. Green friendly being the idea of minimizing my impact vs. “green” which in my opinion is about leaving the world better than you found it — i.e. planting a tree.

I hope this was in some way a help to you,
Jason