EcoWatch: By now, many people know that the ocean is filled with plastic debris. A recent study estimates that the amount of plastic waste that washes off land into the ocean each year is approximately 8 million metric tons. Jenna Jambeck, the studys lead author, helps us visualize the magnitude by comparing it to finding five grocery bags full of plastic on every foot of coastline in the 192 countries included in the study. As someone who lives in a highly urbanized coastal city in California, this estimate...