[He's not the first person to express concern over the machines living on the beach. Izuku voiced the same thing, and Tifa isn't sure if what she had in mind is the best solution, but...]

I don't know anything about them, but what do you think about moving them somewhere else? Can't imagine the garbage is good for them.

[She's no expert by any stretch about the wildlife here, but it's along the same lines as any pollution. It harms the wildlife, and what they need is a clean, safe environment to live in... even if she isn't too fond of the tin cans specifically.]