Shipping moves more than 80% of the world's commodities and transfers up to five billion tonnes of ballast water internationally each year. Vessels, especially large container ships, need ballast tanks to provide stability in the water and correct any shift in the ships’ mass. The UN lists "invasive species" dispersed by ballast water discharges as one of the four main threats to the world's marine ecosystems. bbc
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Does this include humans?
No in all seriousness, this is probably a good thing.
Any marine biologists want to weigh in?
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