Thanks. I'm somewhat skeptical of the "invasive biology" scare too and would like to collect literature on the subject. Unfortunately I can't afford to buy every book on the subject ("buy used: $336.82", whats up with that?), but I did find a book review which gave a good summary I think:

https://www.publish.csiro.au/pc/pdf/PC040070

He does seem to take an extreme position, but it is sometimes beneficial to take in an extreme counterpoint in order to find the reasonable "middle" ground.