It is only our limited time frame that creates the whole "natives versus exotics" controversy. Wind animals, sea currents, and continental drift have always dispersed species into new environments... The planet has been awash in surging , swarming species movement since life began. The fact that it is not one great homogeneous tangled weed lot is persuasive testimony to the fact that intact ecosystems are very difficult to invade.
-Toby Hemenway
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