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Question :
What is the difference between “renewability” and “sustainability”?
Answer:
Bio-based PE (eg. PLA) is identical chemically and technically to petro-based PE. Today bioethanol is produced from crops such as grain or sugar and it is becoming very obvious that this is not “sustainable” due to the ensuing competition for agricultural land and water with food supply and the consequent increase in the cost of foodstuffs. It is described as “renewable” but this is questionable in view of the large amounts of hydro-carbons burned during the growth and polymerisation of crops.
Oxo-biodegradable plastics are made from a by-product of oil, which represents about 2% of each barrel of oil, which used to be wasted.
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