“Well established” aka “we estimate” on estimates of estimates of estimates. Yes, thanks for proving my point in the lack of actual factual data on that field and backing it up with anecdotal evidence about your previous work life. That’s exactly what I was talking about. This is also a huge issue on how scientific studies can skew results in a broader picture that has become a terribly large issue as well and is basically the same garbage that for example the tobacco & oil industries did to provide us with amazing studies that all benefited their cause / push certain agendas. This entire topic becomes even more stupid when you try to apply the data (or estimates of data) from islands, such as New Zealand, and try to apply that onto big continents, such as Europe or the US. Invasive species are always a much bigger issue on islands, because the other species that are native to them have typically no point of retreat & recover. You can’t apply this to landmasses of the size of continents. And doing so with such wonky data points, that on top of that rely on top of other wonky data points, is just making shit up at this stage. That’s also why you people always cite the same study over and over again.