[Greenbuilding] Searching for "Green" window options

[Peter Stone]

Anyone have suggestions for least impact (on the environment that is)  
windows?

Wood seems the only option, but has the disadvantage of being sourced  
from who knows where and higher maintenance. I live in tropical high  
humidity climate and was wondering what the options are for other,  
perhaps reclaimed materials?

I have ruled out any PVC derivatives for obvious reasons, but what  
about Fiberglass? Anyone with more expertise have any thoughts or  
suggestions?

-- Peter