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 plastic threatening living organisms across
the globe.