Plastic rocks discovered on remote Brazilian island.

Researchers have discovered rocks made of plastic debris on Trindade Island, a remote turtle refuge in Brazil. The rocks, called "plastiglomerates," are made of a mixture of sedimentary granules and other debris held together by plastic, mainly from fishing nets. The discovery raises concerns about humans' impact on the planet's geology and ecosystems, as pollution and plastic dumped in the oceans become geological material preserved in the earth's records. Trindade Island is one of the world's most important conservation spots for green turtles, with thousands arriving each year to lay their eggs.