This shoe, the Greenley 2 by Lafuma, is built with highly effective and sustainble materials. The uppers are made of hemp and the lining is a cotton canvas. The shoe also has a removable footbed of tanned leather (made without VI chromium or latex), and natural rubber sole. It is part of Lafuma’s Pure Leaf Collection. The shoe is currently on sale at Amazon for $22: Lafuma Greenley II Sneaker, and they have a similar hemp shoe available, the Lafuma Active Hemp Sneaker.
If you want to see more green shoes and backpacking gear, check out these reviews by Trailspace.