There’s a nice little debate over at Inhabitat about what makes a shoe sustainable–specifically they’re talking about the “Eco-Friendly Footwear” brand Terra Plana. While we’re all for eco-friendly, saving the world and understand using leather isn’t exactly sustainable– we still give a round of applause to the folks at Terra for the effort. Their Worn Again recycled materials campaign is pretty great– and we actually think some of the shoe designs are fun, and a breath of fresh air.