The (almost) perfect crime - A critical reflection of microplastic

(This is my first time publishing in English, so please have mercy on me.)

Microplastics, small and barely visible, are about to rule the world. They pollute the environment and every organism that lives in it, infiltrate them gradually, poisoning them, until the day they'll become murderers. To get killed from the inside without noticing it and with not being able to do something against it - humanity has dug its own grave long before. But not only humans are going to get harmed, animals will get as well.

The murderer who cannot be seen is the worst of all.
The murderer who cannot be seen is the most effective serial killer you've ever seen.

Come, take a seat and grab a cookie while listening to the story of Mic, the microplastic-killer we've created.

Note:
This contest was launched by @NationalGeographic to draw more attention to a worldwide problem. A problem which concerns you and me, your parents and neighbours as well. Therefore i'm going to publish a 500 word short story in english.