….Though marine dumping is part of the problem, escaped nurdles and other plastic litter migrate to the gyre largely from land. That polystyrene cup you saw floating in the creek, if it doesn’t get picked up and specifically taken to a landfill, will eventually be washed out to sea. Once there, it will have plenty of places to go: The North Pacific gyre is only one of five such high-pressure zones in the oceans. There are similar areas in the South Pacific, the North and South Atlantic, and the Indian Ocean. Each of these gyres has its own version of the Garbage Patch, as plastic gathers in the currents. Together, these areas cover 40 percent of the sea. “That corresponds to a quarter of the earth’s surface,” Moore says. “So 25 percent of our planet is a toilet that never flushes.”  Extract From article by Susan Casey