Bamboo uses one-third the amount of water that cotton does to grow. It absorbs five times the volume of greenhouse gasses as an equivalent stand of timber trees and releases 35% more oxygen. Bamboo needs no replanting, pesticides, or fertilizers, and its roots retain water in the watershed, sustaining riverbanks and reducing water pollution. The bamboo used for these pieces is processed with caustic soda, and then washed with water.