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This is Scientific American 60-Second Earth. I'm David Biello. Your minute begins now.

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Humanity inscribes itself into the rock record of Earth's history.

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People now move more sediment than all the world's rivers combined.

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Fossil fuel burning has changed the composition of the atmosphere.

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Everywhere are traces of the sudden appearance of rare radioactive elements like plutonium, a legacy of nuclear weapons.

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And now there's even a new type of rock that people brought into existence.

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Geologists found the novel stone on the beaches of Hawaii.

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Its constituents include solids of volcanic origin, sand, shells and, yes, plastic.

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The discoverers dubbed the material plastiglomerate.

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The finding is in the journal GSA Today, published by the Geological Society of America.

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People's campfires on the beach inadvertently helped create plastiglomerate.

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Some plastic, from a soda bottle, fishing line or a plethora of other possible polymeric sources, found itself near the fire and melted.

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Resultant sticky goo cemented all the disparate bits together.

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The new substance appears to be persistent, destined to stick around for a long, long time.

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And that's the kind of techno-fossil that may prove to be a hallmark of the Anthropocene age, this time of humanity shaping the planet.

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Your minute is up, for Scientific American 60-Second Earth. I'm David Biello,

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