For the last one, either the measurements refer to different things (7cm = square perimeter and 3cm = circle radius is fine) and the researcher was just both lazy and bad at maths ...
... or it should really be classified as Safe for its ability to locally affect measurements, or at least...
IMO, the metaphor in the story is how globalization, best represented by world-wide fast food chains, has only ever hurt various ecosystems around the world to better serve human needs and wants. It's a nice twist to the usual vision of ecological damage caused by human activity : order meat =...
I remember when I searched for a scanlation of this manga over the Internet some years ago, I couldn't find anything. Finally there's one!
Gonna enjoy reading this. Thanks Electromaster for bringing Agharta to Mangadex! :D