Bamboo is just a greenie-weenie politically correct fad. Hardwood yes.
All you eco-freaks, consider that you are just tilting at windmills. The problem is overpopulation, not what kind of wood you use. What will be your substitute for flooring when the population gets to 10 billion from the present nearly 7 billion? Dirt?
"Whatever your cause, it's a lost cause without population control."
That means birth control, abortion, infanticide, spaying. Deal with it or go home.