Quote Originally Posted by Johnson85 View Post
How does that work? I would think fly ash would have minimal impact, basically what you consume shipping it. If you remove it, are you really not replacing it with material that would have roughly equal carbon emissions?
I've worked on a couple of LEED Certified building projects. Green building guidelines look at the complete manufacturing process. Something like fly ash is considered a bad thing b/c of the way it is manufactured (which is typically a by-product of burning something - which the greenies don't like), and to a degree the way it off-gases over time.