I caught an interesting program on one of the science channels about what killed the dinosaurs. Apparently, the asteroid that smashed into the earth at the end of the Cretaceous came at the tail end of on an already full on mass extinction. The theory is that continental drift brought the formerly separate continents together, that critters (especially large dinosaurs) migrated into new continents, that this messed with the ecosystems, and that contact between animals from different continents spread diseases to which the animals lacked immunity.
This sounds like a pretty good argument against unchecked globalization.
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