Biodegradable plastics will degrade over time and turn back into base materials without any extra intervention from people or a supply of oxygen. Compared to petro-chemical plastics, the main difference between a biodegradable plastic and petrochemical plastic relates to carbon. Petroleum based plastics hold carbon after being formed. After they are disposed of, that carbon is slowly released back into the atmosphere through degradation or melting to be recycled. Biodegradable plastics do not release any carbon back into the environment after use. Carbon isn’t used in the initial manufacturing, and isn’t a byproduct as it degrades.
Polylactic acids (PLA) are made from tapioca, cassava, sugarcane, or cornstarch. PLAs are used in manufacturing a large number of consumer products, such as medical implant rods and screws. PLAs are also used widely in one-time use cups, disposable food packaging, and one-time use utensils.
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