Cellulose is made out of recycled news paper, it is about as environmentally friendly as you are going to find, the blue jean insulation is more of a gimmick then anything else from what I can tell, same with the wool insulation.
so if you are going to insulate, do it right and insulation is permanent so make sure it counts, even using foam is not bad if you take in to account that it will last 100 years and help save energy for 100 years.
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