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Portland Cement, Earth Friendly or Not??




Hi
    I need help.  I need to know if Portland Cement would be considered
natural.  I am using it in a project which is supposed to be Earth
Friendly and all natural and the question has been raised whether it
is truly earth friendly or not.  I think it is because I think it has
limestone and clay in the ingredients.  But I don't know for sure.  If
anyone has the answer, please cc answers to me.  
 
 Thanx, 
 CoolEarth



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