Do you know which is the world's "The Most Eco-friendly Textile Tradition”?

Do you know which is the world's "The Most Eco-friendly Textile Tradition”?

Would you like to know more about this textile which is purely natural dyed, and handwoven on a traditional bamboo loom using only natural fibers by the tribal communities since ancient times ( for more than 300 years )?.

Do you know about the only textile tradition in the world which uses the root of Indian Madder Tree (Aal Tree) & Cow dung for dyeing and also uses the most ancient technique of weaving?

To get the knowledge on all the above questions, do check the informative documentary on 
"Kotpad Weaving: The Story of Race Against Time" directed by Biswanath Rath.