No, there are many plant based plastics which are easily broken down in the environment. These plastics are made from sugars and oils produced by a variety of plants. They are currently used for plastic bags, bottles, packaging materials and flower pots to name just a few.
Plastics are extraordinarily useful things, typically very cheaply at present. Heart valves, containers, sanitary packaging, and thousands of other uses. Even if their manufacture and/or improper disposal creates environmental problems, the question must be asked if it is worth it? There are trade-offs in everything. I’m not saying saving a life with a plastic heart valve is better than the environmental degradation related to it – that is an ethical question. But there are such questions with all commodities humans use, from oil/plastic to copper, lanthanum, and magnesium.
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