Dan, I like your Dr Seussian rhyme (not alliteration!) and Tyvekian dream. I too think it's essential to look beyond a Band-Aid solution ("use bio-plastic!") and consider even its repurcussions. Scary indeed. Most system-wide problems - broad, deep, persistent - need to be considered as whole journeys, from raw material acquisition, in the case of a product, through to "death." Keeping a bag made of Tyvek in a sustained cycle of use over time is an ideal scenario, and utterly possible. How might we motivate human behavioral change in this regard...so that bags (regardless of material) are kept, re-used and never thrown away?