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RE: The Holocene Mass Extinction Part 2: Nonstop Invasions
Many insects are also superb invaders - even back in the day when people travelled by horse-cart, they could spread very easily into new areas by contaminating produce (which was then discarded).
The modern age has certainly given us the tools to help them along on an unprecedented scale though.
Oooh, I never thought of the contaminated produce thing. I'm disappointed in myself, since I used to be a medieval/Renaissance studies major before I became a geology major.