Plastic is one of those inventions that transformed the world. It's light, durable and you can make lots of things with it.
But it's also transforming Earth's oceans — and not in a good way. A lot of plastic ends up there. Scientists are just now getting a handle on how much plastic has gone to sea.
Up until now, estimates have been very rough. It's hard to measure waste in the oceans; after all, salt water covers 70 percent of the planet.
But another way to figure out what's out there is to measure how much debris is coming off the land.