Millions of tons of plastic slip into oceans every year. Some floats and travels slowly with the currents, endangering the health of marine animals. The rest is hardly visible but is far more dangerous. Tiny bits of plastic sprinkle the ocean's surface or mix into the sandy seafloor and beaches. It ends up inside birds, fish, and other animals, harming them-and ultimately humans. Experts struggle with fear and hope as they work to stop the flood of...

A team of scientists explore the Great Pacific Garbage Patch, where millions of pieces of plastic have gathered, having drifted there from rivers, beaches, and ocean traffic all over the world.

In the summer of 1997, Charles Moore set sail from Honolulu for California after competing in a trans-Pacific race. When he and his crew took a shortcut through the seldom-traversed North Pacific Subtropical Gyre, a vast oceanic "desert" where winds are slack, Moore realized his ship was skimming through a plastic soup. He had stumbled upon the largest garbage dump on the planet, soon to be dubbed the Great Pacific Garbage Patch--where plastic outweighs...