In the past, we've written about bamboo being one of the greenest building materials. Now, Slate.com investigates if it really is all that. On the pro side, bamboo grows extremely quickly (three feet in one day in one species), and it does so with a minimum of fertilizers. But, unfortunately, all these benefits can be offset by heedless growing and cultivation. Some producers chop down old woodlands to plant the tree and use lots of fertilizers to speed up the growing process. Homeowners considering bamboo should check with the manufacturer to find out how the source material was raised and whether the floors use low-formaldehyde glue.