It's (more) evidence of the (increasing?) extent of the ecological impact of humanity and human societies. We (humans) have proved over and over again that we have a very poor ability to understand the greater consequences of any changes, human-induced or not, to the natural environment. So the fact that we are having an unforeseen impact on the environment should be cause for concern, if not alarm.
That's not to say that when we make deliberate changes to the natural environment we have a good track record. See: e.g. cane toads in Australia[0]