I'm guessing you people don't realize this but almost every company has Bamboo or Polonia in their cores. It's there just a lot of companies don't market what wood is used because they don't want companies stealing their core constructions. I.e. "ultralight weight mystery wood" yeah bullshit it's polonia with poplar shoved in there to make it strong.
The best thing I've ever heard about being more green and using bamboo in the core construction from any company is from Bob Carlson the owner of Arbor "we use bamboo in our boards because it actually has a benefit the way we do it, a lot of companies are just slapping it in there without knowing what they're doing to claim they're green, if it didn't have a benefit in the process that we use we wouldn't do it." That pretty much sums up a lot of companies working with bamboo.