The geology of Brazil’s volcanic Trindade Island has fascinated scientists for years, but the discovery of rocks made from plastic debris in this remote turtle refuge is sparking alarm.

The pollution mainly comes from fishing nets, which is very common debris on Trinidade Island’s beaches. The nets are dragged by the marine currents and accumulate on the beach. When the temperature rises, this plastic melts and becomes embedded with the beach’s natural material. The garbage in the sea and the plastic dumped incorrectly in the oceans is becoming geological material preserved in the earth’s geological records.

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