Further food for thought at Moirae Knitting about the whole “what’s green, what’s not” debate. Is cotton really better for you / the environment considering pesticide use, etc. etc. Moira also has a great list of sources for a wide variety of natural fibres.
From Moirae’s blog: “Yarns and fiber claiming to be environmentally friendly may contain Soysilk™, Silk Latte™ , Inego, bamboo, milk-fiber, Tencel(R), organic cotton and hemp.” She’s still waiting for a final word from the Sierra Club on which is the most earth-friendly.