I think this might be more hype than reality.
The are using polyethylene made from ethanol. Polyethylene is non-biodegradable (it will live forever) and most polyethylene is made from petroleum or natural gas.
It would have been much better to use something like PLA
Polylactic acid - Wikipedia
Poly(lactic acid) or
polylactic acid or
polylactide (
PLA) is a biodegradable and bioactive
thermoplasticaliphatic polyester derived from
renewable resources, such as
corn starch (in the United States and Canada),
cassava roots, chips or starch (mostly in Asia), or
sugarcane (in the rest of the world). In 2010, PLA had the second highest consumption volume of any
bioplastic of the world.
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