An Oregon Field Guide special report: Unprecedented numbers of non-native species are showing up on Northwest shores after hitching a ride on plastic debris. Plastics are a growing problem in the world's oceans, and more than half of that trash gets there through rivers. How is Oregon contributing to the problem? We'll travel the state, testing some of our most iconic rivers for tiny plastics to see where the trash is showing up. Scientists predict that plastic in the ocean will eventually outweigh fish in the ocean. Many of those plastics are ending up in our seafood.