If green is the way you,d like to go, then you would need to read this document from greenpeace on the effects of using pvc products. I think you,d need to follow up on the document as I believe it is some years old now, and may have had more relevence to the pvc in production back then. I know they are currently involved in composite material for window manufacture , that has a far less negative impact on the environment than the previous products.
Full Article.
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sabre
Full Article.
[broken link removed]
sabre