From a strictly environmental perspective, bamboo is a grass and can grow in a lot of places without much help. As a former cotton grower, I can tell you that cotton takes a lot of water, fertilizer, and pesticides. When it's ready to harvest, more chemicals are sprayed on to drop the leaves, and then it's harvested by fuel-guzzling machines. That being said, I admit to using Warm and Natural. (But I do recycle and I don't drive much!)