If you've been on or near the water, you've seen it—the plastic trash that litters oceans, lakes, and streams worldwide. But visible plastic—soda bottles, lighters, flip-flops, combs, rope—may be the least of the problem. Scientists are beginning to realize that what you can't see, tiny bits of polyethylene or polypropylene called "microplastics," likely pose a greater threat to marine ecosystems.
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