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And all species are invasive, given half a chance.

True, but we are particularly nasty.

Few species have spread as far and wide as we have, and at this point the ones that are ubiquitous are already adapted to the environment

Not on Earth according to the data that we have. We seem to be quite unique when it comes to our ability to impact our surroundings.

We are the certainly the most invasive species that has appeared in a very long time, but our uniqueness is only a matter of how fast we spread and how aggressively we reshape ecosystems.