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I think of most invasives as biological pollution. They're just plants doing what plants do, can't blame them, and it is humans who screw things up by moving stuff around so much, but I think it's better to limit it than ignore it. Just because they're not diseases or insects like chesnut blight or HWA or whatever, doesn't mean they don't do damage.
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The way I see it we have one main invasive species. "Australopithicus afarensis". This species lived many millions of years ago and has been polluting the earth ever since. The main characteristic of this species is it can think. It thinks anything that does not fit into its self created "order of things" is wrong, bad, incorrect, invasive, and needs to be destroyed, controlled, illiminated or contained in some manner. I like a quote I saw on this board. "We need to think logically and bio-logically. Think of it from a plants perspective. Why the heck are they reproducing so aggressively. It's because we have created an environment conductive to their reproduction. A healthy woods is a biolocially stable entity that controls the growth of its "dwellers". What can exist in a woods does. What can't... well, it propagates itself in the wake of our destructio to the earth.
Treating plants as invasive species again does not get to the root of the problem.