The emerald ash borer, a shiny green beetle from Asia, hitchhiked to Detroit. This beetle could kill every ash tree in North Amercia. According to the story, "fighting the 7000 invasive species documented in the United States costs taxpayers at least $138 billion per year." In fact, the beetle killed a total of 6 million ash trees in Maryland, Michigan, Ohio, and Ontario. This story highlights the damage done, and how the government offers little protection.
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