One of the problems with shipping things around in a global network of material commerce is that other things can stow aboard. Invader species can wipe out populations of native plants and animals, who have no natural defenses against the aliens. Long Beach, California is one of the largest cargo ports in the United States.
You can zoom up from this image to see the incredible size and scope of moving almost six million cargo containers through per year. In recent years, those cargo containers have been mostly full of manufactured goods from Asia.
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