Green Tree Retention. It specifically means the practice leaving certain trees in these planted forests but its evolved to encompass much more research and practices.

This whole debate is happening because Google rushed to clear the sites before the EIA was completed which was meant to identify the sites of dense native forests. Google claims it did its own internal reviews and preserved a few crucial sites, but the Finnish Association for Nature Conservation, aka Suomen luonnonsuojeluliitto, (which is the group that got work stopped) used satellite imagery to prove there were multiple dense native forest sites that also got cut down

Google's entire bet here is that it could turn this into a "procedural issue" of "woops, we didn't quite finish the EIA before we started. oh well, we'll just pay the fine" because they clearly knew there was plenty of protected dense native forest patches. They wanted to remove all the evidence of them as quickly as possible