Join Date: Oct 2009
Location: Santa Cruz, CA
Bikes: 2011 Cannondale Supersix 5, heavily upgraded 2000 Trek XO-1, Specialized Carve Expert 2013, 89 Trek 330 FG conversion, unknown 80s Basso road frame frankenbike
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OP, I think your quest is slightly silly considering the relative durability of cycling shoes, their performance-oriented nature, and the relatively small amount of materials used in their construction. However, I did find something for you: http://www.keenfootwear.com/us/en/pr...0pedal/****ake
. Natural leather upper, although I suspect it's effectively impossible to buy a cycling shoe that does not have some kind of synthetic material for a sole, and honestly it's not like leather is an amazingly low impact material to process. Also the interior of the show is probably made out of synthetic materials.
For what it's worth the shoes you linked to are attractive looking. Of course, for the same cash, you could buy some nice conventional, mass market cycling shoes (even used to be more eco groovy!) and send the Sierra Club or Greenpeace or The Nature Conservatory or whatever like a hundred bucks and have more practical shoes and do more to help the environment.