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1. Introduction Click to copy section linkSection link copied! The modern era of humans on Earth is marked by the global proliferation of plastics, considered indicators of the Anthropocene. (1,2) The ubiquity and magnitude of plastic accumulation on Earth make them emergent contaminants of concern, (3) a novel component of the carbon cycle (4) and a planetary boundary threat.
Since the beginning of widespread plastic manufacturing and use in the 1950s, the mass of plastic-carbon (e.g., mass of carbon contained in synthetic polymers, plastic-C) has grown to rival biogeochemically relevant natural carbon stocks. (1) Much of this plastic is used in the production of one-use or short-lifespan commercial items; of all plastics produced since 1950 only an estimated 30% is still in use.
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