The plants die even before they get to live. That's really sad.

[ Nier still comes from a world where there's a dwindling population so he didn't know too much about the ways of people until more recently. When he hears about Tifa's world he feels his chest tighten deeply. Surely, it's not right if the plants and nature itself withers away in an instant. Tifa is fighting an important battle and Nier recognizes that. ]

You're all working to protect something worth fighting for. I really respect you for that, Tifa.