Most bamboo is grown on farm fields created by slash and burn of native forests in Southeast Asia. The short crop rotation leads many to believe it is a greener material than wood, but further investigation shows it is anything but. Bamboo is grown with little or no environmental regulations, unlike commercial woods in the United States and Canada which end up in plywood and OSB. Furthermore, bamboo is very prone to splitting and will be difficult to work with as a sheathing material. I would offer the opinion that a temporary structure is not green unless it will be reused or disassembled into components for reuse. Here is a good link for more info: http://www.dovetailinc.org/DovetailBamboo.html