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> Their overgrowth not only disrupt the variety of the local vegetation world, but also the balance of the animal world, sometimes including us.
Yes. Towards the end of the article, the author points out that the debate isn't really over whether species which overwhelm an ecosystem and threaten most other species there are harmful or not. They all agree these things are a problem. The argument is over whether we should see any transplanted species as dangerous or whether we should only see some transplanted species as dangerous. As dynamic and unstable as ecosystems tend to be, I'd rather we erred on the side of the conservationists. Organisms will migrate, and they'll inevitably bring other organisms with them, but since we have the ability to manage this, to some degree, we probably should, even if it's only to keep an environment friendly to us around as long as possible.