Well the other woods are from FSC-certified, sustainable and managed forests, so at least they're not chopping down trees at random.
I went with ebony on my original Moto X (which is great btw), but I think I'm going Teak this time around. Just can't decide on the accent color.
Thanks for that information. I don't know how you guys find this stuff out!

FSC certainly tries hard... there are problems with their certifications sometimes, but it's definitely better than nothing, and I'm glad to see that Moto X is using those sources.
I wish I knew what kind of wood they're really using for the backs other than bamboo, but no matter how many creative ways I try to ask the question, the people at Motorola won't tell me. :-X